CUET UG Booster Biology Unit 7 Test (M5) -

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CUET UG Booster Biology Unit 7 Test (M5)

⏱️ 30 Minutes

❓ 20 Questions

📌 Answers are locked once submitted — results and explanations appear at the end.

CUET UG Booster Biology Unit 7 Test (M5)

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QUESTION 1 OF 20

Which of the major abused drugs is an alkaloid that directly interferes with the transport of a neuro-transmitter, rather than just binding to opioid or cannabinoid receptors?

Answer Review

1 Which of the major abused drugs is an alkaloid that directly interferes with the transport of a neuro-transmitter, rather than just binding to opioid or cannabinoid receptors?

A Heroin

B Morphine

C Cocaine

D Hashish

💡 Short Explanation

Cocaine is a natural alkaloid extracted from the South American plant Erythroxylum coca. Unlike opioids and cannabinoids, it targets chemical signaling pathways instead of specialized drug receptors. It works by blocking the reuptake transport of the neurotransmitter dopamine in the central nervous system.

✅ Correct Answer Explanation

Cocaine is a natural plant alkaloid that has a unique mechanism of action compared to other abused substances. While opioids (like heroin and morphine) bind to specific opioid receptors in the central nervous system and gastrointestinal tract, and cannabinoids (like hashish) interact with dedicated cannabinoid receptors in the brain, cocaine acts directly on synaptic chemical transmission. It blocks the reuptake transporters responsible for clearing the neurotransmitter dopamine from the synaptic cleft. This block leads to an accumulation of dopamine, causing continuous stimulation of the brain's reward pathways. This unique mechanism produces a strong sense of euphoria and increased energy, confirming Option C as the correct choice.

❓ Why Other Options Are Incorrect

Option A → Heroin is a semi-synthetic opioid derivative (diacetylmorphine) that acts by binding to specific opioid receptors, slowing down body functions.
Option B → Morphine is a natural opioid alkaloid extracted from the poppy plant that binds directly to opioid receptors to relieve pain.
Option D → Hashish is a concentrated cannabinoid resin mix that interacts with cannabinoid receptors to primarily affect the cardiovascular system.

🎯 Strategy

Used: Odd One Out

Application: Group the choices by their biological mechanism. Heroin, morphine, and hashish all act by binding directly to dedicated drug receptors (opioid or cannabinoid receptors). Cocaine stands out because it acts by interfering with a natural neurotransmitter transport system.

Final Logic: Since cocaine is the only option that alters dopamine transport rather than binding to a dedicated drug receptor, it is the correct answer.

🧠 Memory Trick

Cocaine Clocks Dopamine: Cocaine interferes with chemical Communication by trapping Dopamine in the brain.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Cocaine and Hallucinogens

2 Regarding the biological sources of commonly abused drugs, read the following statements:
i. The majority of these drugs are obtained from flowering plants.
ii. Some abused drugs are obtained from fungi.
iii. All central nervous system depressants are exclusively fungal in origin.
Which statements are accurate based on the text?

A i and ii

B ii and iii

C i and iii

D i only

💡 Short Explanation

The vast majority of abused drugs, including opioids, cannabinoids, and coca alkaloids, are harvested from flowering plants (Angiosperms). Certain hallucinogenic and psychoactive compounds are derived from fungal sources, such as the ergot fungus. Central nervous system depressants like morphine and heroin come from the opium poppy, which is a flowering plant, making statement iii false.

✅ Correct Answer Explanation

Let us analyze each biological source statement based on the NCERT text: Statement i is correct: The textbook states that the majority of commonly abused drugs are obtained from flowering plants (such as Papaver somniferum, Cannabis sativa, and Erythroxylum coca). Statement ii is correct: Certain psychoactive substances, such as lysergic acid diethylamide (LSD), are sourced from fungi (like the ergot fungus Claviceps purpurea). Statement iii is incorrect: Main central nervous system depressants like morphine and heroin are derived from the latex of the opium poppy, which is a flowering plant, rather than being exclusively fungal in origin. Since statements i and ii are correct, Option A is the right answer.

❓ Why Other Options Are Incorrect

Option B → This choice includes the incorrect statement iii and leaves out the accurate statement i regarding flowering plants.
Option C → This combination includes the false statement iii, which claims that depressants are exclusively fungal in origin.
Option D → This choice leaves out statement ii, ignoring the fact that several abused drugs are sourced from fungi.

🎯 Strategy

Used: Extreme Word Filter

Application: Look closely at statement iii, which uses the extreme word "exclusively" (exclusively fungal in origin). In biology, absolute claims are often false. Remembering that morphine comes from a poppy flower helps you easily disprove this statement.

Final Logic: Eliminating statement iii removes options B and C, and since statement ii is correct, Option A is the required choice.

🧠 Memory Trick

Flowers First, Fungi Follow: Most drugs come from Flowers, some come from Fungi, and nothing is Exclusively locked to one group.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Major Abused Drugs

3 The chemical structure shown belongs to a compound that acts on specific receptors. What happens to the body functions when its common derivative (smack) binds to these receptors?

A It acts as a stimulant, speeding up body functions.

B It acts as a depressant and slows down body functions.

C It creates strong hallucinations.

D It exclusively increases heart rate.

💡 Short Explanation

The reference chemical structure represents the morphine molecule. The common derivative known as "smack" is heroin (diacetylmorphine). Heroin acts as a central nervous system depressant that slows down metabolic and body functions.

✅ Correct Answer Explanation

The question references the chemical structure of morphine, a natural opioid. Acetylation of morphine produces its well-known derivative, diacetylmorphine, commonly referred to as "smack" or heroin. When heroin enters the bloodstream, it binds to specific opioid receptors located in the central nervous system (CNS) and the gastrointestinal (GI) tract. Instead of stimulating these tissues, opioids act as central nervous system down-regulators. This binding slows down physiological processes, reducing heart rate, suppressing respiration, and lowering gastrointestinal motility. This matches the description in Option B.

❓ Why Other Options Are Incorrect

Option A → Substances like cocaine and amphetamines act as stimulants; opioids have the opposite effect by slowing body systems down.
Option C → Hallucinations are caused by drugs like LSD, psilocybin, or high doses of Datura, not by standard down-regulating opioids.
Option D → Opioids typically lower or stabilize heart rate through their depressant effects, rather than increasing it.

🎯 Strategy

Used: Contextual/Tonal Matching

Application: Identify the substance from the keyword "smack." NCERT explicitly defines smack as heroin, an opioid. Under opioid pharmacology, the textbook describes its physiological action as a "depressant" that "slows down body functions," pointing directly to Option B.

Final Logic: "Smack" is a well-known depressant that slows down body functions, confirming Option B.

🧠 Memory Trick

Smack Slows You Down: Smack acts as a Slow-down depressant for the System.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Opioids

4 What chemical process is applied to the molecule shown in the image to synthetically produce the white, bitter compound known as Heroin?

A Methylation

B Hydrolysis

C Acetylation

D Dehydration

💡 Short Explanation

Heroin is chemically classified as diacetylmorphine. It is produced by adding acetyl groups to the chemical structure of morphine. The specific chemical reaction used to convert morphine into heroin is acetylation.

✅ Correct Answer Explanation

The chemical structure in the text represents morphine, an alkaloid extracted from the latex of the opium poppy (Papaver somniferum). To produce heroin, morphine undergoes a synthetic chemical reaction where two acetyl groups are attached to its molecular structure. This process is called acetylation, and it produces diacetylmorphine, a white, odorless, bitter crystalline compound known as heroin or "smack". This chemical modification increases the molecule's lipid solubility, allowing it to cross the blood-brain barrier quickly and produce stronger effects. This confirms Option C as the correct answer.

❓ Why Other Options Are Incorrect

Option A → Methylation involves adding a methyl group (–CH₃). Adding a methyl group to morphine produces codeine, not heroin.
Option B → Hydrolysis splits a molecule apart using water, which would break down chemical bonds instead of creating diacetylmorphine.
Option D → Dehydration reactions remove water molecules to form double bonds, which does not add the acetyl groups needed to make heroin.

🎯 Strategy

Used: Substitution / Direct Association

Application: Connect the chemical name of the final product with the corresponding chemical process. Since heroin is chemically known as diacetylmorphine, the prefix diacetyl- points directly to an acetylation reaction.

Final Logic: The prefix in diacetylmorphine confirms that acetylation is the reaction used to produce heroin, making Option C correct.

🧠 Memory Trick

Morphine to Heroin via Acetylation: Make Heroin Active.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Opioids

5 Match the drug/chemical to its specific plant part or source method as described:

Column 1	Column 2
1. Cannabinoids	a. Acetylation of latex extract
2. Heroin	b. Extracted from Erythroxylum leaves
3. Cocaine	c. Flower tops, leaves, and resin combinations
4. Hashish and Charas	d. Natural extraction from Cannabis inflorescences

A 1-d, 2-b, 3-a, 4-c

B 1-c, 2-a, 3-b, 4-d

C 1-d, 2-a, 3-b, 4-c

D 1-a, 2-c, 3-d, 4-b

💡 Short Explanation

Cannabinoids are extracted generally from the inflorescences of the Cannabis sativa plant. Heroin is produced by the acetylation of morphine, which is extracted from poppy latex. Cocaine is an alkaloid obtained from the leaves of the South American shrub Erythroxylum coca. Hashish and charas are specific products made from combinations of cannabis flower tops, leaves, and resins.

✅ Correct Answer Explanation

Let us match each substance with its biological source and preparation method: 1. Cannabinoids →(d) Natural extraction from Cannabis inflorescences: Group of chemicals derived from the flower clusters of the hemp plant. 2. Heroin →(a) Acetylation of latex extract: Produced by chemically processing the raw latex collected from poppy seedpods. 3. Cocaine →(b) Extracted from Erythroxylum leaves: An alkaloid harvested from the foliage of the coca plant. 4. Hashish and Charas →(c) Flower tops, leaves, and resin combinations: Specific concentrates produced by mixing different parts of the cannabis plant. This complete set follows the 1-d, 2-a, 3-b, 4-c pattern, matching Option A.

❓ Why Other Options Are Incorrect

Option B → This option incorrectly matches basic cannabinoids with raw resin combinations (1-c) and shifts the plant source to the end.
Option C → This choice incorrectly links heroin with Erythroxylum leaves (2-b) and cocaine with latex processing (3-a).
Option D → This layout incorrectly matches cannabinoids with acetylation (1-a) and misaligns the other plant sources.

🎯 Strategy

Used: Option Grouping

Application: Choose a clear, distinct pairing as your starting anchor. Cocaine is extracted from the leaves of the Erythroxylum plant, so 3 must match with b. Checking the options shows that only Option A and Option B feature this pairing, instantly eliminating choices C and D.

Final Logic: Looking at the remaining options, general cannabinoids are derived from the plant's inflorescences (1 matches with d), which confirms Option A as the correct layout.

🧠 Memory Trick

Cocaine from Erythroxylum →Heroin from Acetylation →Cannabinoids from Cannabis inflorescences.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Major Abused Drugs

6 Which of the following modes of intake is NOT generally associated with cannabinoids causing cardiovascular effects?

A Inhalation

B Oral ingestion

C Intravenous injection

D Smoking

💡 Short Explanation

Cannabinoids are typically consumed through inhalation, smoking, or oral ingestion. Once absorbed, they interact with receptors in the brain to affect the cardiovascular system, primarily by increasing heart rate. Intravenous injection is not a standard or common method of intake for natural cannabinoids.

✅ Correct Answer Explanation

The NCERT text outlines specific, traditional methods for consuming cannabinoids. These substances are naturally absorbed through the respiratory or digestive systems, making inhalation (A), oral ingestion (B), and smoking (D) the standard routes of administration. These consumption methods allow the active compounds to enter the bloodstream and interact with cannabinoid receptors, which primarily affects the cardiovascular system by increasing heart rate and altering blood pressure. In contrast, intravenous injection (C) is a route of administration associated with soluble opioids like heroin or liquid stimulants, rather than natural cannabinoid preparations. This makes Option C the correct choice for this "NOT" question.

❓ Why Other Options Are Incorrect

Option A → Inhalation is a major route of cannabinoid consumption that allows the active compounds to enter the bloodstream through the lungs.
Option B → Oral ingestion, such as consuming cannabis-infused edibles or sweets, is a common method of drug intake mentioned in the text.
Option D → Smoking dried plant parts is a very common method of cannabinoid intake that leads to rapid cardiovascular effects.

🎯 Strategy

Used: Contextual/Tonal Matching

Application: Align the options with the descriptions of drug use in the NCERT text. The textbook states that cannabinoids are "generally taken by inhalation and oral ingestion." Because intravenous injection is omitted from this section, it stands out as the incorrect method.

Final Logic: Since intravenous injection is not an established method for using cannabinoids in the text, Option C is the correct answer.

🧠 Memory Trick

Inhale or Ingest, Skip the Needle: Cannabinoids are taken through the Lungs or Mouth; they are not used with an Injection.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Cannabinoids

7 Which of the following does NOT describe the pharmacological action of Erythroxylum coca extract?

A It stimulates the central nervous system.

B It acts as a depressant slowing down GI tract motility.

C It causes a sense of euphoria.

D It interferes with dopamine transport.

💡 Short Explanation

Erythroxylum coca is the plant source of cocaine, which is a powerful central nervous system stimulant. Cocaine works by blocking dopamine transport, which increases energy and creates a sense of euphoria. Slowing down gastrointestinal motility is a feature of depressant drugs like opioids, rather than stimulants.

✅ Correct Answer Explanation

Erythroxylum coca yields cocaine, which acts as a powerful central nervous system stimulant (Option A). It works by blocking the reuptake of the neurotransmitter dopamine, disrupting normal chemical transport in the brain (Option D). This accumulation of dopamine leads to increased alertness, high energy, and a strong sense of euphoria (Option C). On the other hand, slowing down gastrointestinal motility and acting as a body depressant (Option B) is the classic mechanism of action for opioids like morphine and heroin. Because Option B describes opioid pharmacology instead of cocaine function, it is the correct choice for this "NOT" question.

❓ Why Other Options Are Incorrect

Option A → This is a true effect; cocaine acts as a central nervous system stimulant that increases alertness and keeps the body active.
Option C → This is a true effect; the buildup of dopamine in the brain's reward pathways produces a strong feeling of euphoria.
Option D → This is a true effect; cocaine's primary mechanism of action is blocking the transport proteins that reabsorb dopamine.

🎯 Strategy

Used: Odd One Out

Application: Group the choices by their overall physiological effect. Options A, C, and D all describe the stimulating, energy-boosting properties of cocaine. Option B describes a slowing down of body systems, which matches the properties of a depressant instead of a stimulant.

Final Logic: Since slowing down gastrointestinal motility contradicts the stimulating properties of cocaine, Option B is the false statement and the correct answer.

🧠 Memory Trick

Cocaine Speeds, Opioids Slow: Cocaine Stimulates brain and body functions; it never acts as a Slowing depressant.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Cocaine and Hallucinogens

8 Arrange the following drugs/plants in order of their primary described effects:

List 1	List 2
1. Painkiller	a. Heroin
2. Hallucinogen	b. Cocaine
3. Stimulant	c. Morphine
4. Depressant	d. Datura

A a-1, b-2, c-3, d-4

B c-1, d-2, b-3, a-4

C c-1, a-2, b-3, d-4

D a-4, b-3, c-1, d-2

💡 Short Explanation

Morphine is a medical alkaloid used as a strong painkiller for surgery patients. Datura is a wild plant that contains alkaloids capable of causing hallucinations. Cocaine is an alkaloid that acts as a central nervous system stimulant. Heroin is an down-regulating opioid derivative that acts as a strong body depressant.

✅ Correct Answer Explanation

Let us map each drug to its primary pharmacological effect as described in the NCERT text: 1. Painkiller →(c) Morphine: Used in hospitals as an effective analgesic to relieve severe pain for post-surgery patients. 2. Hallucinogen →(d) Datura: A plant containing tropane alkaloids that cause vivid hallucinations when consumed. 3. Stimulant →(b) Cocaine: An alkaloid that increases alertness and energy by interacting with dopamine transport. 4. Depressant →(a) Heroin: A substance that slows down metabolic pathways and basic body functions. Mapping these pairs matches the layout: c-1, d-2, b-3, a-4, which corresponds to Option B.

❓ Why Other Options Are Incorrect

Option A → This choice incorrectly matches heroin as a plain painkiller (a-1) and misidentifies cocaine as a hallucinogen (b-2).
Option C → This sequence incorrectly pairs heroin with hallucinogenic properties (a-2) and misidentifies Datura as a plain depressant (d-4).
Option D → While the individual pairings are correct, this choice writes the sequence backward relative to the 1, 2, 3, 4 order requested in the prompt.

🎯 Strategy

Used: Sequence/Chronological Logic

Application: Match the first required category with its corresponding drug to anchor your choice. The first category is "Painkiller," which matches morphine (c). This means the sequence must open with the c-1 pair. Checking the options shows that only Option B and Option C start with c-1.

Final Logic: The second category is "Hallucinogen," which matches Datura (d), forming the d-2 pair. This rules out Option C and leaves Option B as the correct answer.

🧠 Memory Trick

Morphine Mutes pain →Datura Distorts reality →Cocaine Charges energy →Heroin Halts body functions.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Major Abused Drugs

9 Nicotine stimulates the adrenal gland to release specific hormones. What is the immediate physiological consequence of this release?

A Decrease in blood pressure to induce calmness

B Immediate drop in carbon monoxide levels

C Raised blood pressure and increased heart rate

D Deepening of the voice and muscle growth

💡 Short Explanation

Nicotine is an alkaloid found in tobacco that acts on the endocrine system. It stimulates the adrenal medulla to secrete the hormones adrenaline and noradrenaline into the bloodstream. These hormones trigger a fight-or-flight response, which raises blood pressure and increases heart rate.

✅ Correct Answer Explanation

Tobacco smoke contains nicotine, a chemical compound that affects the endocrine system. When nicotine enters the bloodstream, it stimulates the adrenal glands (specifically the adrenal medulla) to release the hormones adrenaline and noradrenaline. These hormones act on the cardiovascular system, causing blood vessels to constrict and forcing the heart to beat faster. The immediate physical results of this hormonal release are raised blood pressure and an increased heart rate, both of which strain the cardiovascular system over time. This directly validates Option C.

❓ Why Other Options Are Incorrect

Option A → Nicotine acts as a chemical stimulant that raises blood pressure, rather than lowering it to induce calmness.
Option B → Smoking tobacco increases carbon monoxide levels in the blood; it does not lower them.
Option D → Voice changes and muscle growth are controlled by sex hormones like testosterone, not by the adrenaline release caused by nicotine.

🎯 Strategy

Used: Contextual/Tonal Matching

Application: Align the option choices with the body's natural response to adrenaline. Since adrenaline is the body's primary "fight-or-flight" hormone, its release always acts to speed up cardiovascular functions. This concept helps you quickly identify Option C as the right choice.

Final Logic: Because adrenaline release naturally increases heart rate and blood pressure, Option C is the correct answer.

🧠 Memory Trick

Nicotine Pumps Adrenaline: More Adrenaline in the blood Accelerates heart rate and raises blood pressure.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Tobacco and Nicotine

10 Identify the correct statements regarding the health impacts of smoking:
i. It increases the incidence of lung and urinary bladder cancers.
ii. It increases carbon monoxide (CO) content in the blood.
iii. It cures gastric ulcers by reducing stomach acidity.
iv. It is associated with emphysema and coronary heart disease.

A i, ii, and iii

B ii, iii, and iv

C i, iii, and iv

D i, ii, and iv

💡 Short Explanation

Smoking delivers carcinogens and toxins that increase the risk of cancers in the lungs, throat, and urinary bladder. Tobacco smoke introduces carbon monoxide into the bloodstream, which binds to hemoglobin and reduces oxygen transport. Chronic smoking damages lung tissue, leading to emphysema, and irritates the stomach lining, which increases the risk of gastric ulcers instead of curing them.

✅ Correct Answer Explanation

Let us review each statement about the health impacts of smoking based on the NCERT text: Statement i is correct: Tobacco smoke contains carcinogens that cause cellular damage, increasing the risk of cancers in the lungs, throat, and urinary bladder. Statement ii is correct: Inhaling smoke introduces carbon monoxide (CO) into the bloodstream. CO binds to hemoglobin more effectively than oxygen, reducing oxygen transport throughout the body. Statement iii is incorrect: Smoking increases gastric acid secretion and irritates the stomach lining, which increases the risk of developing gastric ulcers rather than curing them. Statement iv is correct: Chronic smoking breaks down alveoli walls in the lungs, causing emphysema, and damages blood vessels, leading to coronary heart disease. Since statements i, ii, and iv are correct, Option D is the right answer.

❓ Why Other Options Are Incorrect

Option A → This combination includes the incorrect statement iii and leaves out the well-documented link between smoking and emphysema (iv).
Option B → This choice includes the incorrect statement iii, which claims that smoking helps cure gastric ulcers.
Option C → This grouping includes the false statement iii and leaves out statement ii regarding carbon monoxide levels.

🎯 Strategy

Used: Elimination

Application: Check the medical validity of each statement. Statement iii claims that smoking acts as a medical cure for gastric ulcers by reducing acidity. Since smoking actually increases stomach acidity and worsens ulcers, statement iii is false. You can eliminate any option containing statement iii.

Final Logic: Eliminating statement iii removes options A, B, and C from consideration, leaving Option D as the correct choice.

🧠 Memory Trick

Smoke Damages Everything, Cures Nothing: Smoking causes Cancer, generates Carbon monoxide, and ruins the Cardiovascular system; it never cures an illness.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Tobacco and Nicotine (Health Hazards)

11 Why is adolescence considered a highly vulnerable phase for drug and alcohol abuse?

A It involves rigid, unchanging biological conditions.

B It is a phase of mental and psychological development accompanied by curiosity and need for adventure.

C The immune system is completely dormant during this period.

D Receptors in the brain only form after the age of 18.

💡 Short Explanation

Adolescence is a transitional growth phase characterized by rapid biological and psychological changes. Natural curiosity, a drive for adventure, and a desire to experiment make teenagers more likely to try substances. Adolescents often perceive drug or alcohol use as a way to express independence or cope with stress.

✅ Correct Answer Explanation

According to the NCERT text, adolescence is not just a chronological age bracket but a dynamic phase of mental and psychological development. During this period, a young person's mindset is highly impressionable and driven by a natural sense of curiosity, a desire for adventure, and an eagerness to experiment. Initial drug or alcohol use is frequently motivated by these traits, as well as a common perception among youth that experimenting with substances is "cool" or a sign of maturity. Because Option B perfectly captures these psychological drivers, it represents the primary reason why this phase is so vulnerable to substance abuse.

❓ Why Other Options Are Incorrect

Option A → Adolescence is marked by rapid, fluid biological and hormonal changes rather than rigid or unchanging conditions.
Option C → The immune system remains fully active during adolescence, protecting the body against pathogens as it does in other life stages.
Option D → Brain receptors (including opioid, cannabinoid, and nicotinic receptors) are fully formed and functional from childhood; they do not suddenly appear at age 18.

🎯 Strategy

Used: Contextual/Tonal Matching

Application: Align the choices with the core psychological and developmental themes discussed in the NCERT text on adolescent behavior. The text focuses on curiosity, experimentation, and adventure as key traits of youth, pointing directly to Option B.

Final Logic: Since curiosity and a drive for adventure are the primary traits that define adolescent vulnerability in the text, Option B is correct.

🧠 Memory Trick

Adolescent Curiosity: The Adolescent phase is a time of Adventure and Attachment to new experiences, driven by natural curiosity.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Adolescence and Drug/Alcohol Abuse

12 Which of the following is NOT cited as a major motivating factor for youngsters to start using drugs and alcohol?

A Need for adventure and excitement

B Pressures to excel in academics

C High levels of nurturance and consistent discipline

D The perception that smoking or drug use is 'cool'

💡 Short Explanation

High nurturance and consistent discipline from parents serve as protective factors for youth. Destructive motivators like academic stress, curiosity, and peer pressure drive substance use. Stable, supportive family dynamics significantly lower the risk of an adolescent turning to drugs.

✅ Correct Answer Explanation

The NCERT text divides family and social factors into triggers that drive substance abuse and protective structures that prevent it. Destructive forces like a need for adventure (A), intense academic pressure to excel (B), and the misleading social perception that substance use is 'cool' (D) are well-documented triggers that push young people toward drugs. On the other hand, growing up in a supportive home environment with high levels of care, balanced nurturance, and consistent parental discipline provides emotional stability. This stability reduces a teenager's vulnerability to substance abuse, making Option C a protective factor rather than a driving motivator, and the correct answer for this "NOT" question.

❓ Why Other Options Are Incorrect

Option A → This is a true motivating factor; a desire to experience new sensations frequently leads to initial experimentation.
Option B → This is a true motivating factor; severe stress from unrealistic exam and family expectations often pushes youth to seek an unhealthy escape.
Option D → This is a true motivating factor; popular media and peer cultures often glorify substance use, drawing vulnerable teenagers in.

🎯 Strategy

Used: Odd One Out

Application: Group the options by their impact on a teenager's well-being. Options A, B, and D all describe stressful, unstable, or risky factors that can lead to unhealthy choices. Option C describes a healthy, positive family structure.

Final Logic: Because a supportive family structure prevents drug use rather than motivating it, Option C is the odd one out and the correct choice.

🧠 Memory Trick

Supportive Homes Protect: Balanced Care and Discipline protect a child from developing an addiction.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Adolescence and Drug/Alcohol Abuse

📄 Passage

Dependence is the tendency of the body to manifest a characteristic and unpleasant withdrawal syndrome if regular dose of drugs/alcohol is abruptly discontinued. This is characterised by anxiety, shakiness, nausea and sweating, which may be relieved when use is resumed again. In some cases, withdrawal symptoms can be severe and even life threatening.

According to the passage, how is the unpleasant withdrawal syndrome temporarily relieved by an addict?

A By drinking large amounts of water

B By abruptly discontinuing all substances

C By resuming the use of the drug or alcohol

D By seeking immediate isolation

💡 Short Explanation

Withdrawal syndrome occurs when a dependent person abruptly stops using a substance. The body reacts with uncomfortable symptoms like anxiety, shaking, and sweating. The provided text notes that these symptoms are temporarily relieved when the individual resumes using the drug.

✅ Correct Answer Explanation

This is a passage-based comprehension question that requires extracting information directly from the text. The passage states that withdrawal syndrome occurs when regular doses of a drug are stopped suddenly. It explicitly notes that these symptoms—including anxiety, shakiness, nausea, and sweating—"may be relieved when use is resumed again." When an individual gives in to cravings and resumes substance use, they temporarily stop the withdrawal response, reinforcing their psychological and physical dependence. This directly confirms Option C.

❓ Why Other Options Are Incorrect

Option A → Drinking water is a healthy habit, but it does not address the underlying neurochemical imbalances that cause withdrawal symptoms.
Option B → Abruptly stopping substance use is the exact trigger that causes withdrawal syndrome, rather than a way to relieve it.
Option D → Social isolation does not relieve physical symptoms like sweating or shaking, and it can make severe withdrawal more dangerous if medical help is needed.

🎯 Strategy

Used: Substitution / Literal Matching

Application: Scan the provided text for the phrase "relieved when." The passage contains the exact text string "which may be relieved when use is resumed again," which matches Option C.

Final Logic: The exact mechanism for relieving withdrawal symptoms is explicitly stated in the passage, confirming Option C.

🧠 Memory Trick

Resuming Stops the Syndrome: Resuming substance use temporarily Relieves the physical discomfort of withdrawal.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Addiction and Dependence

📄 Passage

Based on the text, what physiological condition defines "Dependence"?

A The psychological attachment to euphoria only

B The tendency to manifest withdrawal symptoms upon abrupt discontinuation

C The sudden increase in academic performance

D The permanent cure of anxiety and shakiness

💡 Short Explanation

Dependence is a physical state where the body has adjusted to the regular presence of a drug. If the drug is stopped suddenly, the body's altered systems are disrupted, causing withdrawal symptoms. The passage explicitly defines dependence by this tendency to show withdrawal symptoms when use is discontinued.

✅ Correct Answer Explanation

This question requires identifying the exact definition of "Dependence" provided in the passage. The first sentence of the text states: "Dependence is the tendency of the body to manifest a characteristic and unpleasant withdrawal syndrome if regular dose of drugs/alcohol is abruptly discontinued." While addiction involves a psychological craving for a high, dependence is an adaptive physical state where the body needs the substance to function normally. If the substance is removed, the body responds with clear physical distress, validating Option B.

❓ Why Other Options Are Incorrect

Option A → A psychological attachment to euphoria describes the core nature of addiction, whereas the text uses withdrawal symptoms to define dependence.
Option C → Substance dependence causes a decline in daily functioning and grades, rather than an increase in academic performance.
Option D → Dependence causes temporary anxiety and shakiness during withdrawal, rather than providing a permanent cure for them.

🎯 Strategy

Used: Substitution / Literal Matching

Application: Match the definition of the term with the opening sentence of the passage. The text explicitly links "Dependence" with the "tendency... to manifest a characteristic and unpleasant withdrawal syndrome," pointing directly to Option B.

Final Logic: The passage provides a direct, literal definition of dependence, confirming Option B.

🧠 Memory Trick

Dependence Drives Withdrawal: When the body Depends on a drug, stopping it creates Withdrawal symptoms.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Addiction and Dependence

15 Arrange the sequence of events showing how intravenous drug abuse leads to fatal consequences:
1. Transfer of viruses from one person to another
2. Direct injection of drugs into the vein using a needle and syringe
3. Acquiring chronic infections like AIDS and Hepatitis B
4. Sharing of infected needles and syringes

A 2, 4, 1, 3

B 1, 2, 3, 4

C 4, 2, 1, 3

D 2, 1, 4, 3

💡 Short Explanation

Intravenous drug users inject substances directly into their bloodstream using syringes. Sharing these needles allows trace amounts of blood to remain on the equipment. This practice transfers blood-borne viruses directly from an infected user to another person. Over time, this path leads to the transmission of chronic, life-threatening infections like AIDS or Hepatitis B.

✅ Correct Answer Explanation

This question requires mapping out the biological and behavioral steps that link intravenous drug use to severe health consequences: Step 1 (Event 2): The process begins when an individual chooses the direct injection of drugs into a vein using a needle and syringe. Step 2 (Event 4): Within drug-using groups, users often engage in the dangerous practice of sharing infected needles and syringes. Step 3 (Event 1): Sharing contaminated needles leads directly to the transfer of viruses from one person to another via leftover blood droplets. Step 4 (Event 3): This direct transmission results in the new host acquiring chronic infections like AIDS and Hepatitis B. This logical progression follows the 2, 4, 1, 3 sequence, which matches Option A.

❓ Why Other Options Are Incorrect

Option B → This sequence places viral transfer (1) at the very beginning of the timeline, before any needles have been shared or used.
Option C → This version suggests that needles are shared (4) before any injection takes place (2), reversing the basic steps of the process.
Option D → This choice implies that viruses are transferred (1) before users share needles and syringes (4).

🎯 Strategy

Used: Sequence/Chronological Logic

Application: Identify the initial action and the final health outcome of the timeline. The process must start with the act of injection (2) and end with the long-term medical diagnosis of a chronic illness (3). The sequence must open with 2 and close with 3.

Final Logic: This chronological rule eliminates choices B, C, and D, confirming Option A as the only logical sequence.

🧠 Memory Trick

The Injection Infection Path: Inject drugs →Share needles →Transfer blood →Contract chronic infection.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Effects of Drug/Alcohol Abuse

16 Match the warning signs/effects to their respective categories:

Colum 1	Column 2
1. Academic drop and lack of hygiene	(a) Result of intravenous drug abuse
2. Coma and death	(b) Warning signs among youth
3. Stealing	(c) Immediate adverse effect of extreme overdose
4. AIDS and Hepatitis B	(d) Farreaching implication to satiate drug needs

A 1-a, 2-d, 3-c, 4-b

B 1-c, 2-b, 3-a, 4-d

C 1-b, 2-c, 3-d, 4-a

D 1-d, 2-a, 3-b, 4-c

💡 Short Explanation

Falling grades and neglecting personal hygiene are common early warning signs of drug use in youth. An extreme drug overdose can depress the central nervous system, leading to a coma or death. Turning to illegal acts like stealing is a behavioral consequence driven by the need to fund an expensive habit. AIDS and Hepatitis B are chronic viral infections transmitted by sharing needles during intravenous drug use.

✅ Correct Answer Explanation

Let us match each behavioral or clinical sign with its correct category from the NCERT text: 1. Academic drop and lack of hygiene →(b) Warning signs among youth: Early behavioral changes that help parents and teachers spot potential drug use. 2. Coma and death →(c) Immediate adverse effect of extreme overdose: Acute, life-threatening physical reactions caused by a toxic level of a drug shutting down the brain and lungs. 3. Stealing →(d) Far-reaching implication to satiate drug needs: Secondary criminal behaviors that occur when an individual runs out of money to buy drugs. 4. AIDS and Hepatitis B →(a) Result of intravenous drug abuse: Long-term infectious diseases spread by sharing contaminated injection equipment. This matching pattern follows the 1-b, 2-c, 3-d, 4-a sequence, found in Option C.

❓ Why Other Options Are Incorrect

Option A → This version incorrectly lists falling grades as a specific result of needle sharing (1-a) and misaligns the other choices.
Option B → This choice incorrectly matches early warning signs with drug overdoses (1-c) and shifts the remaining categories out of place.
Option D → This layout incorrectly pairs basic school warning signs with secondary criminal actions (1-d).

🎯 Strategy

Used: Option Grouping

Application: Choose a distinct, life-threatening combination as your anchor. Coma and death are acute physical responses to an extreme drug overdose, so 2 must match with c. Checking the options shows that only Option B and Option C feature this pairing, instantly eliminating choices A and D.

Final Logic: Early signs of drug use in students include falling grades and changes in hygiene (1 matches with b), which confirms Option C as the correct layout.

🧠 Memory Trick

Grades Drop = Youth Warning →Overdose = Coma/Death →Need Cash = Stealing →Needles = AIDS/Hepatitis.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Effects of Drug/Alcohol Abuse

17 Which of the following is NOT an effect of chronic alcohol/drug use?

A Liver cirrhosis

B Nervous system damage

C Decreased sperm production in males

D Instantaneous cure of chronic infections

💡 Short Explanation

Long-term substance abuse weakens the body's organs and immune defenses over time. Chronic drinking damages liver tissue and impairs central nervous system functions. Using drugs and alcohol weakens the immune system, making the body more vulnerable to infections rather than curing them.

✅ Correct Answer Explanation

Chronic, long-term use of drugs and alcohol causes widespread damage to multiple systems in the human body. Long-term alcohol consumption leads to fat accumulation and permanent scarring in the liver, known as liver cirrhosis (Option A), and acts as a neurotoxin that damages brain and nerve cells (Option B). Additionally, abusing substances like anabolic steroids can disrupt hormone levels, leading to decreased sperm production in males (Option C). Substance abuse suppresses immune function and wears down the body's defenses, making it harder to fight off illnesses. Therefore, claiming it leads to an "instantaneous cure of chronic infections" (Option D) is entirely false, making it the required answer for this "NOT" question.

❓ Why Other Options Are Incorrect

Option A → This is a true consequence; long-term heavy alcohol consumption is a leading cause of liver cirrhosis.
Option B → This is a true consequence; chronic substance abuse damages pathways in the brain and peripheral nervous system over time.
Option C → This is a true consequence; abusing synthetic hormones or chronic alcohol use can disrupt the endocrine system and lower sperm counts.

🎯 Strategy

Used: Extreme Word Filter / Odd One Out

Application: Look closely at the phrasing in Option D ("instantaneous cure"). In medicine, claiming that a chronic substance abuse habit instantly cures deep-seated viral or bacterial infections is medically inaccurate and contradicts the documented health risks of drug use.

Final Logic: Because substance abuse harms immune function rather than curing infections, Option D is false and is the correct choice here.

🧠 Memory Trick

Abuse Harms health: Drugs and alcohol Damage body systems over time; they never provide an instant Cure for diseases.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Long-term Effects of Alcohol/Drug Abuse

18 What are the specific side effects observed in females due to the abuse of anabolic steroids?

A Premature baldness and prostate enlargement

B Masculinisation, excessive facial hair, and deepening of voice

C Reduction in the size of testicles

D Stunted growth without mood swings

💡 Short Explanation

Anabolic steroids are synthetic hormones that mimic the effects of testosterone in the body. When females misuse these steroids, the excess male hormones cause them to develop male physical traits. These side effects include a deepening of the voice, facial hair growth, and masculinization.

✅ Correct Answer Explanation

Anabolic steroids are synthetic derivatives of the male sex hormone testosterone, used by some athletes to increase muscle mass and performance. When females abuse these substances, the introduction of high levels of androgenic hormones overrides their natural endocrine balance. This hormonal shift causes them to develop male secondary sex characteristics, a process known as masculinization. The NCERT text explicitly lists the resulting side effects in females, including excessive facial and body hair growth, a deepening of the voice, irregular menstrual cycles, enlargement of the clitoris, and increased aggressiveness. This confirms Option B as the correct answer.

❓ Why Other Options Are Incorrect

Option A → Prostate enlargement is a condition that affects male anatomy, and premature male-pattern baldness is a side effect typically seen in males using steroids.
Option C → Testicular shrinkage is a side effect that occurs uniquely in males who use steroids, due to a shutdown of natural testosterone production.
Option D → While steroids can cause stunted growth by closing bone growth plates early, they are also associated with severe mood swings, making this claim incorrect.

🎯 Strategy

Used: Elimination

Application: Check the gender context specified in the question prompt ("in females"). This context allows you to quickly eliminate options A and C, as prostate tissue and testicles are part of male anatomy. You can also rule out Option D, because steroid use is strongly linked to emotional changes and mood swings.

Final Logic: Eliminating the male-specific side effects leaves Option B as the accurate description of steroid damage in females.

🧠 Memory Trick

Steroids Bring Masculine Traits: Taking male hormones causes females to experience Masculinization, including a Deeper voice and Facial hair.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Misuse of Anabolic Steroids (Side Effects)

19 What combination of parenting traits has been specifically associated with a lowered risk of substance abuse in adolescents?

A Strict isolation and financial deprivation

B High levels of nurturance and consistent discipline

C Ignoring the child's choices and forceful discipline

D Total freedom without any boundaries

💡 Short Explanation

Healthy family dynamics play an important role in preventing adolescent substance abuse. A home environment that combines emotional support with clear boundaries helps protect teenagers from peer pressure. Providing high nurturance alongside consistent discipline gives youth the stability they need to avoid drugs.

✅ Correct Answer Explanation

The NCERT text highlights several preventive measures to protect adolescents from the risks of drug and alcohol abuse. A key factor is the nature of the home and parenting environment. Raising a child with a balance of high levels of nurturance (providing emotional support, open communication, and care) alongside consistent discipline (setting clear boundaries, values, and guidance) creates a supportive foundation. This stable environment helps teenagers build resilience and handles the emotional challenges of youth without turning to substances as a coping mechanism. This directly validates Option B.

❓ Why Other Options Are Incorrect

Option A → Forcing a teenager into isolation and withholding resources causes emotional distress, which can increase the risk of substance use.
Option C → Ignoring a child's feelings and using harsh, forceful punishment can alienate them, causing them to turn to substances to escape family conflict.
Option D → Granting total freedom without any guidance leaves adolescents vulnerable to negative peer pressure without a clear sense of boundaries.

🎯 Strategy

Used: Contextual/Tonal Matching

Application: Look for the option that presents a balanced, health-focused approach to raising children. Options A and C describe overly harsh parenting methods, while Option D describes a lack of guidance. Option B balances support with guidance, matching the preventive philosophy in the text.

Final Logic: Because a balance of care and clear boundaries helps protect a teenager's mental health, Option B is the correct answer.

🧠 Memory Trick

Nurture and Guide: Combining warm Nurturance with steady Discipline builds the resilience needed to stay away from drugs.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Prevention and Control

20 If parents find danger signs of alcohol/drug use in their child, what is the immediate recommended step?

A Hide the problem from society to protect family reputation

B Expel the child from school immediately

C Seek appropriate medical and professional help to diagnose underlying causes

D Force the child into intense physical sports

💡 Short Explanation

Early intervention is critical when an adolescent shows warning signs of substance use. Trying to handle severe substance use through family pressure or concealment can make the problem worse. Getting help from doctors, psychologists, and counselors provides the necessary tools for diagnosis and recovery.

✅ Correct Answer Explanation

When parents or teachers identify the warning signs of drug or alcohol use in an adolescent, the NCERT guidelines advise against reacting with anger, denial, or punishment. Addiction is a complex condition that often stems from underlying emotional or social stress. The immediate recommended step is to seek appropriate medical and professional help. Consulting with qualified psychologists, psychiatrists, and de-addiction specialists allows families to address the root causes of the behavior. This professional care ensures that the adolescent receives under-lying diagnostic support and behavioral therapy to recover safely, confirming Option C.

❓ Why Other Options Are Incorrect

Option A → Hiding the problem out of concern for family reputation delays care, allowing the addiction to worsen without intervention.
Option B → Pulling a student out of school isolates them from supportive peers and teachers, increasing their stress and potential substance use.
Option D → Forcing a child into intense sports without addressing the underlying causes of their substance use ignores the root problem and can cause additional stress.

🎯 Strategy

Used: Contextual/Tonal Matching

Application: Identify the option that focuses on medical care and patient recovery. Options A, B, and D respond to the issue with concealment, isolation, or force. Option C views substance use as a health condition that benefits from professional care, matching the medical perspective of the text.

Final Logic: Getting professional therapy and medical support addresses the root causes of addiction, confirming Option B as the correct choice.

🧠 Memory Trick

Professional Care First: When warning signs appear, rely on Medical Help and therapy to guide the child toward a safe recovery.

📚 Class XII – Biology – Chapter: Human Health and Disease – Topic: Prevention and Control

CUET UG Booster Biology Unit 7 Test (M5)

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