CUET UG Biology Booster Test 2 Population and Contraception -

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CUET UG Biology Booster Test 2 Population and Contraception

⏱️ 30 Minutes

❓ 20 Questions

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

CUET UG Biology Booster Test 2 Population and Contraception

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QUESTION 1 OF 20

Question
Match the following:

List I	List II
1. World (1900–2011)	a. Growth from ~350 million to >1.2 billion
2. India (1947–2011)	b. Population rocketed from 2 billion to 7.2 billion
3. Census 2011	c. Scarcity of food, shelter, and clothing
4. Alarming Growth	d. Growth rate less than 2%

Answer Review

1 Question
Match the following:

List I	List II
1. World (1900–2011)	a. Growth from ~350 million to >1.2 billion
2. India (1947–2011)	b. Population rocketed from 2 billion to 7.2 billion
3. Census 2011	c. Scarcity of food, shelter, and clothing
4. Alarming Growth	d. Growth rate less than 2%

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

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

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

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

💡 Short Explanation

The world population increased from about 2 billion to 7.2 billion between 1900 and 2011. India's population increased from about 350 million at Independence to over 1.2 billion by 2011. The 2011 Census reported a growth rate of less than 2%, while alarming population growth leads to shortages of basic resources.

✅ Correct Answer Explanation

According to NCERT, the world population increased dramatically from approximately 2 billion in 1900 to about 7.2 billion in 2011. India's population also grew rapidly from around 350 million at Independence (1947) to more than 1.2 billion by the 2011 Census. Although the 2011 Census reported a population growth rate of less than 2% per year, rapid population growth continues to exert pressure on basic necessities such as food, shelter, clothing, healthcare, and employment. Therefore, Option A is the correct answer.

❓ Why Other Options Are Incorrect

Option B → Incorrectly swaps the world and India population trends.
Option C → Incorrectly matches Census 2011 and the effects of alarming population growth.
Option D → All the pairings are incorrectly matched.

🎯 Strategy

Used: Chronological Fact Matching

Application: Match each demographic milestone and its associated fact based on NCERT data.

Final Logic:

World → 2B to 7.2B
India → 350M to 1.2B
2011 Census → Growth rate <2%
Alarming Growth → Scarcity of basic necessities

🧠 Memory Trick

"World 2→7, India 350→1200, Census <2, Growth = Scarcity."

📚 This corresponds to Option A. Here's the polished version in your standard format.

2 Match the following:

List I	List II
1. Population Explosion	a. Impact of health facilities/living conditions
2. Death Rate Decline	b. Contributed to rapid population increase
3. Reproductive Age Group	c. Increase in number of people in this group
4. Growth Rate	d. Marginally reduced by RCH

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

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

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

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

💡 Short Explanation

Better healthcare and living conditions contributed to population explosion. Declining death rates accelerated population growth. A larger reproductive-age population sustains future population increase. RCH programmes have helped reduce the population growth rate.

✅ Correct Answer Explanation

According to NCERT, improvements in healthcare, sanitation, nutrition, and living conditions have significantly reduced death rates, leading to population explosion. A decline in mortality, coupled with an increasing proportion of people in the reproductive age group, has sustained rapid population growth. Programmes such as Reproductive and Child Health (RCH) have contributed to a gradual reduction in the overall population growth rate by promoting family planning and reproductive health awareness.

❓ Why Other Options Are Incorrect

Option B → Incorrect because Population Explosion is not directly reduced by RCH, and Death Rate Decline is not the impact of health facilities itself.
Option C → Incorrect because the reproductive-age group is not defined by health facilities, and Population Explosion is not an increase in the reproductive-age group.
Option D → Incorrect because it reverses the cause-and-effect relationships among the demographic factors.

🎯 Strategy

Used: Cause-and-Effect Matching

Application: Match each demographic concept with its direct consequence or associated factor based on NCERT.

Final Logic:

Better Health → Lower Death Rate → Population Explosion → RCH Reduces Growth Rate

🧠 Memory Trick

"Health ↓ Deaths ↑ Population; RCH ↓ Growth."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Population Explosion and Population Growth

3 Arrange the following goals of the RCH programme in the logical order of their achievement for a healthy society:
(i) Awareness about reproduction-related aspects
(ii) Provision of medical facilities and support
(iii) Decrease in MMR and IMR
(iv) Improved reproductive health of the society

A i-ii-iii-iv

B iv-iii-ii-i

C ii-i-iv-iii

D iii-iv-i-ii

💡 Short Explanation

Awareness leads to better utilization of facilities. Facilities lead to better health outcomes (lowered mortality). Better health outcomes result in a healthy society.

✅ Correct Answer Explanation

The RCH programme follows a systemic hierarchy: First, generate awareness (i) about reproductive health. Second, provide the necessary infrastructure and medical support (ii) to the public. Third, as facilities are used, MMR and IMR decline (iii). Finally, these results culminate in the overall improved reproductive health of the society (iv).

❓ Why Other Options Are Incorrect

Option B → Incorrect; suggests the end result occurs before the intervention.
Option C → Incorrect; places medical provision before awareness, which is not the program's primary focus.
Option D → Incorrect; logical sequence of events is flawed.

🎯 Strategy

Used: Substitution

Application: Follow the chronological implementation logic of public health programs (Awareness $\rightarrow$ Services $\rightarrow$ Results).

Final Logic: Awareness is the first step in any health initiative.

🧠 Memory Trick

"Awareness $\rightarrow$ Support $\rightarrow$ Low Mortality $\rightarrow$ Health."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Reproductive Health –

4 Arrange these demographic milestones in India by their chronological appearance in the sources:
(i) Initiation of 'family planning' programmes
(ii) Population reaching close to the billion mark
(iii) Crossing of 1.2 billion in population
(iv) 2011 Census report on growth rate

A i-ii-iii-iv

B i-iv-iii-ii

C ii-i-iv-iii

D iv-iii-ii-i

💡 Short Explanation

The sequence begins with the initiation of family planning programmes. This is followed by the 2011 Census report on growth rate. Next comes the crossing of the 1.2 billion population mark. Finally, the population reaches close to the billion mark in the given sequence.

✅ Correct Answer Explanation

According to the given sequence, the demographic milestones are arranged as follows: (i) Initiation of 'family planning' programmes (iv) 2011 Census report on growth rate (iii) Crossing of 1.2 billion in population (ii) Population reaching close to the billion mark Thus, the required order is: i → iv → iii → ii which corresponds to Option B.

❓ Why Other Options Are Incorrect

Option A follows a different sequence and does not match the required arrangement.
Option C begins with the population nearing one billion instead of family planning.
Option D starts with the latest event and reverses the required order.

🎯 Strategy

Used: Sequence Matching

Application:

Compare each option with the required order of events and identify the one that reproduces the sequence exactly.

Final Logic:

Only Option B matches the sequence i → iv → iii → ii.

🧠 Memory Trick

Plan → Census → 1.2 Billion → Billion

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Population Explosion

5 Analyze the following statements regarding population control measures:
(i) Raising marriage age for females to 18 and males to 21 is a statutory measure.
(ii) "Hum Do Hamare Do" is a slogan designed to motivate smaller families.
(iii) The government uses incentives to encourage couples to have small families.
(iv) These measures were forced by the risk of absolute scarcity of basic requirements.

A All statements are correct

B Only i and ii are correct

C Only iii and iv are correct

D i, ii, and iii are correct

💡 Short Explanation

Marriage ages are statutory requirements. "Hum Do Hamare Do" is the official slogan. Incentives (financial/social) are common to promote small families. Resource scarcity is the underlying reason for these measures.

✅ Correct Answer Explanation

All four statements are accurate representations of government policy. The statutory age limit (i) is a legal requirement. The slogan (ii) is the classic method of public messaging. Government incentives (iii) are a standard policy tool, and the entire framework of population control is indeed motivated by the fear of resource depletion (iv) due to rapid population growth.

❓ Why Other Options Are Incorrect

Options B, C, and D → Incorrect; they fail to recognize that all provided statements are factually consistent with the chapter.

🎯 Strategy

Used: Contextual/Tonal Matching

Application: Verify each statement against the overarching goals of Indian population policy.

Final Logic: All statements represent confirmed components of population control.

🧠 Memory Trick

"Statutory Age, Slogans, Incentives, Scarcity."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Population Explosion –

6 Regarding the RCH programmes and population growth:
(i) RCH stands for Reproductive and Child Health Care.
(ii) These programmes helped bring down the growth rate significantly to zero.
(iii) The 2011 growth rate was less than 2 percent.
(iv) A 2% growth rate is considered a rate at which population could increase rapidly.

A i, iii, and iv are correct

B i and ii are correct

C ii and iii are correct

D All are correct

💡 Short Explanation

RCH stands for Reproductive and Child Health. Growth rate did NOT drop to zero; it just declined. 2011 rate was ~20/1000 (2%). 2% is a rapid growth rate.

✅ Correct Answer Explanation

Statement (i) correctly defines RCH. Statement (iii) is correct as the rate was approximately 20/1000, which is 2%. Statement (iv) is correct because a 2% growth rate leads to doubling in a short period (rapid increase). Statement (ii) is incorrect because the growth rate has not reached zero; it has only shown a reduction trend.

❓ Why Other Options Are Incorrect

Options B, C, and D → Incorrect; they include the false statement (ii).

🎯 Strategy

Used: Elimination

Application: Eliminate the statement claiming "zero" growth, as no country has reached zero growth rate in this context.

Final Logic: Growth rate decreased, but did not vanish.

🧠 Memory Trick

"RCH: Reproductive + Child Health; 2% = Rapid."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Reproductive Health –

7 Which of the following is NOT a reason why a contraceptive might be considered "ideal"?

A It is effective with no or least side-effects.

B It interferes with the sexual drive of the user to reduce acts.

C It is easily available and user-friendly.

D It is reversible for future family planning.

💡 Short Explanation

Ideal contraceptives do not suppress libido. Interference with sexual drive is undesirable. Ideal methods should be "sexually neutral."

✅ Correct Answer Explanation

An ideal contraceptive is designed to be highly effective, reversible, user-friendly, and should have no (or minimal) side effects. Critically, it must not interfere with the sexual drive, desire, or the sexual act itself. Interfering with the sexual drive is a negative trait, not an ideal one.

❓ Why Other Options Are Incorrect

Option A → Incorrect; this is a core "ideal" requirement.
Option C → Incorrect; this is a core "ideal" requirement.
Option D → Incorrect; this is a core "ideal" requirement.

🎯 Strategy

Used: Extreme Word Filter

Application: The phrase "interferes with sexual drive" is inherently negative and contrary to health promotion goals.

Final Logic: Contraceptives should enable safe sex, not inhibit it.

🧠 Memory Trick

"Ideal = Effective, Safe, No interference."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Contraception –

8 Which of these side effects is NOT listed in the sources as a possible (though not significant) ill-effect of contraceptives?

A Breakthrough bleeding

B Abdominal pain

C Permanent loss of hearing

D Nausea

💡 Short Explanation

Contraceptive side effects are usually minor/temporary. Common ones: Nausea, abdominal pain, irregular bleeding. Hearing loss is not a known clinical side effect.

✅ Correct Answer Explanation

Contraceptives may sometimes cause minor side effects such as nausea, abdominal pain, or breakthrough bleeding. However, permanent loss of hearing is not associated with contraceptive use in standard medical guidelines or the NCERT source material.

❓ Why Other Options Are Incorrect

Option A → Incorrect; this is a known potential side effect.
Option B → Incorrect; this is a known potential side effect.
Option D → Incorrect; this is a known potential side effect.

🎯 Strategy

Used: Elimination

Application: Eliminate the common side effects listed in medical literature/textbooks.

Final Logic: Permanent hearing loss is not a contraceptive side effect.

🧠 Memory Trick

"Side effects = Minor (Nausea, Bleeding, Pain)."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Contraception –

9 Negative / Not Associated Type
Regarding "Natural Methods" of contraception, which statement is NOT associated with their functioning?

A They work on the principle of avoiding chances of ovum and sperm meeting.

B They involve the use of specialized rubber barriers.

C Side effects are almost nil because no medicines are used.

D Chances of failure are relatively high compared to other methods.

💡 Short Explanation

Natural methods are behavioral (timing/withdrawal). Barriers are "Barrier Methods," not natural. Natural methods rely on no devices.

✅ Correct Answer Explanation

Natural methods are based on avoiding the chance of ovum and sperm meeting (A). They involve no medicines, so side effects are nil (C). They are less effective than other methods (D). Option (B) describes "Barrier Methods," which are a separate category involving external devices like condoms, not natural methods.

❓ Why Other Options Are Incorrect

Option A → Incorrect; this is the core principle of natural methods.
Option C → Incorrect; this is a correct feature of natural methods.
Option D → Incorrect; this is a correct feature of natural methods.

🎯 Strategy

Used: Categorization

Application: Separate "Natural Methods" (behavioral) from "Barrier Methods" (mechanical).

Final Logic: Natural = No devices.

🧠 Memory Trick

"Natural = No Device, No Barrier."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Natural Methods –

10 Which is NOT a correct description of "Withdrawal" as a contraceptive method?

A It is also known as coitus interruptus.

B The male partner withdraws before ejaculation.

C It is a highly effective barrier method using latex.

D Its goal is to avoid insemination in the female reproductive tract.

💡 Short Explanation

Coitus interruptus is a behavioral method. It does not use latex or barriers. "Barrier" implies an external device.

✅ Correct Answer Explanation

Withdrawal (coitus interruptus) involves the male partner withdrawing the penis before ejaculation (A, B). The objective is to avoid insemination (D). Option (C) incorrectly describes it as a "barrier method using latex," which refers to condoms, not coitus interruptus.

❓ Why Other Options Are Incorrect

Option A → Incorrect; this is the correct technical name.
Option B → Incorrect; this is the correct action.
Option D → Incorrect; this is the correct purpose.

🎯 Strategy

Used: Odd One Out

Application: Identify the description (latex barrier) that contradicts the definition of a natural method.

Final Logic: Withdrawal $\neq$ Barrier device.

🧠 Memory Trick

"Withdrawal = No device."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Natural Methods –

11 Absence of menstruation during lactation Lactational amenorrhea is considered a "natural" method because:

A It uses herbal medicines to stop the cycle.

B It relies on a physiological state where no devices or chemicals are used.

C It is performed by a doctor during delivery.

D It involves the use of specialized barriers during lactation.

💡 Short Explanation

It is a natural biological cycle effect. No external materials are required. It works by suppressing hormonal pathways.

✅ Correct Answer Explanation

Lactational amenorrhea is classified as a natural method because it is based on the biological reality that ovulation and the menstrual cycle do not occur during intense lactation. It requires no external intervention—no medications, no devices, and no barrier materials.

❓ Why Other Options Are Incorrect

Option A → Incorrect; it does not use herbal medicines.
Option C → Incorrect; it is not "performed" by a doctor.
Option D → Incorrect; it does not involve barriers.

🎯 Strategy

Used: Substitution

Application: Define "natural" in the context of contraception (no chemicals/devices).

Final Logic: Natural = Physiological.

🧠 Memory Trick

"Natural = Biological / No device."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Lactational Amenorrhea –

12 Six-month effectiveness limit
Why is the effectiveness of lactational amenorrhea limited to six months?

A Because the mother usually stops producing milk then.

B Because the period of "intense lactation" that prevents ovulation typically declines after this period.

C Because the child begins to walk.

D Because the government regulates its use to six months only.

💡 Short Explanation

Intense lactation suppresses gonadotropins. Frequency of feeding/intensity drops after 6 months. Ovulation potential increases as intensity drops.

✅ Correct Answer Explanation

Lactational amenorrhea works only during the period of "intense lactation" where hormonal signals (prolactin) successfully inhibit the hypothalamic-pituitary-ovarian axis, preventing ovulation. After six months, the intensity and frequency of breastfeeding usually decrease, and the biological suppression of ovulation is no longer guaranteed, leading to a risk of conception.

❓ Why Other Options Are Incorrect

Option A → Incorrect; lactation often continues.
Option C → Incorrect; child development does not regulate ovulation.
Option D → Incorrect; regulation is not the reason; physiology is.

🎯 Strategy

Used: Contextual/Tonal Matching

Application: Align the biological concept of "intense" breastfeeding with the time constraint.

Final Logic: Less intense feeding $\rightarrow$ Ovulation resumes.

🧠 Memory Trick

"6 Months = End of intense milk production."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Lactational Amenorrhea –

13 Which feature of condoms provides "privacy to the user"?

A They are reusable and must be cleaned.

B They can be self-inserted and are disposable.

C they require a doctor's assistance for insertion.

D They are only available in hospitals.

💡 Short Explanation

Self-insertion avoids clinical visits. Disposability removes the need for cleanup or storage. Privacy = No external assistance.

✅ Correct Answer Explanation

Condoms are highly valued because they allow for self-application without needing a healthcare provider (which ensures privacy). Being disposable, they require no special care, further enhancing the user's personal convenience and privacy.

❓ Why Other Options Are Incorrect

Option A → Incorrect; they are not reusable.
Option C → Incorrect; they do not require a doctor.
Option D → Incorrect; they are widely available (pharmacies, stores).

🎯 Strategy

Used: Contextual/Tonal Matching

Application: Match "privacy" to the lack of clinical intervention.

Final Logic: Self-use = Privacy.

🧠 Memory Trick

"Self-use = Private."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Barrier Methods –

14 Protection against STIs and AIDS Condoms are unique among the listed barrier methods because they:

A Are the only ones that are reusable.

B Provide protection against the transmission of STIs and AIDS.

C Are only available for females.

D Require specialized fitting by a nurse.

💡 Short Explanation

Physical barrier prevents fluid exchange. STI/AIDS transmission involves fluid exchange. This feature is a primary reason for their popularity.

✅ Correct Answer Explanation

While many barrier methods prevent pregnancy, condoms are uniquely effective in preventing the spread of STIs and AIDS. This is due to their design, which creates a complete fluid-tight sheath, blocking the exchange of bodily fluids.

❓ Why Other Options Are Incorrect

Option A → Incorrect; condoms are single-use.
Option C → Incorrect; they are available for males and females.
Option D → Incorrect; they are "over-the-counter" (OTC), no fitting required.

🎯 Strategy

Used: Substitution

Application: Select the benefit most associated with public health campaigns regarding condoms.

Final Logic: Barrier = Prevention of STIs.

🧠 Memory Trick

"Barrier = Pregnancy + Disease protection."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Barrier Methods –

15 To increase the contraceptive efficiency of diaphragms and cervical caps, they are usually used along with:

A Copper ions

B Spermicidal creams, jellies, and foams

C Hormone releasing injections

D Oral pills

💡 Short Explanation

Physical barrier alone can leak. Spermicides add a chemical "kill zone." This combination increases efficacy.

✅ Correct Answer Explanation

Barrier methods like diaphragms and cervical caps have a failure rate if not placed perfectly. Using them in combination with chemical agents—specifically spermicidal creams, jellies, and foams—creates a chemical barrier that kills any sperm that might bypass the physical cap, significantly increasing efficiency.

❓ Why Other Options Are Incorrect

Option A → Incorrect; copper is for IUDs.
Option C → Incorrect; hormones are for pills/injections.
Option D → Incorrect; pills are a systemic method, not an adjunct.

🎯 Strategy

Used: Option Grouping

Application: Group the accessory chemical agents (spermicides) with the mechanical barrier.

Final Logic: Physical + Chemical = High Efficiency.

🧠 Memory Trick

"Cap + Spermicide = Double defense."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Female Barrier Methods –

16 Reusability of female barriers
The fact that diaphragms and cervical caps are reusable means they:

A Are made of thin, disposable latex like condoms.

B Can be used multiple times after proper care, unlike disposable condoms.

C Must be surgically removed after each use.

D Do not provide any privacy to the user.

💡 Short Explanation

Reusable items require maintenance (washing). Unlike condoms (trash), these are assets. Proper care prevents infection.

✅ Correct Answer Explanation

The main differentiator between condoms and devices like diaphragms or cervical caps is reusability. They are constructed from durable materials, allowing the user to wash and store them for future use, provided they follow hygiene protocols.

❓ Why Other Options Are Incorrect

Option A → Incorrect; they are unlike disposable condoms.
Option C → Incorrect; they are self-removable.
Option D → Incorrect; they provide privacy.

🎯 Strategy

Used: Elimination

Application: Eliminate the statement identifying them as disposable (A).

Final Logic: Reusable = Durable/Washable.

🧠 Memory Trick

"Reusable = Wash + Store."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Female Barrier Methods –

📄 Passage

"IUDs increase phagocytosis of sperms within the uterus and the Cu ions released suppress sperm motility and the fertilising capacity of sperms. The hormone releasing IUDs, in addition, make the uterus unsuitable for implantation and the cervix hostile to the sperms. IUDs are ideal contraceptives for the females who want to delay pregnancy and/or space children."

Unlike the medicated IUDs mentioned in the passage, a non-medicated IUD like the Lippes loop primarily works by:

A Releasing copper ions to kill sperms.

B Increasing phagocytosis of sperms within the uterus.

C Releasing hormones to block ovulation.

D Making the cervix hostile through steroid preparation.

💡 Short Explanation

Non-medicated = Passive/Physical presence only. Presence triggers WBC (phagocytosis). It does not release ions or hormones.

✅ Correct Answer Explanation

The Lippes loop is a non-medicated device; it does not release any chemical agents (ions/hormones). Its contraceptive effect is entirely derived from its presence in the uterus, which triggers an inflammatory response that increases the phagocytosis of sperms by immune cells.

❓ Why Other Options Are Incorrect

Option A → Incorrect; this is a copper-IUD mechanism.
Option C → Incorrect; this is a hormonal-IUD mechanism.
Option D → Incorrect; this is a hormonal-IUD mechanism.

🎯 Strategy

Used: Elimination

Application: Eliminate all mechanisms involving drug release (copper/hormones).

Final Logic: No drug release = Phagocytosis effect.

🧠 Memory Trick

"Lippes = Passive/Phagocytosis."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Intra Uterine Devices –

📄 Passage

According to the passage, the specific advantage of using copper-releasing IUDs (CuT, Cu7) over non-medicated ones is:

A They make the uterus unsuitable for implantation.

B They release Cu ions that suppress sperm motility.

C They are oral tablets taken once a week.

D They are the only reversible method available.

💡 Short Explanation

Copper ions have a spermicidal effect. They specifically target motility and fertilizing capacity. This adds a chemical layer to the mechanical effect.

✅ Correct Answer Explanation

The passage states that copper-releasing IUDs function by releasing copper ions. These ions specifically act to suppress the motility and fertilizing capacity of the sperms, providing a much higher level of contraceptive efficacy than non-medicated loops, which only rely on phagocytosis.

❓ Why Other Options Are Incorrect

Option A → Incorrect; this is the mechanism of hormone-releasing IUDs.
Option C → Incorrect; IUDs are not oral tablets.
Option D → Incorrect; there are many reversible methods.

🎯 Strategy

Used: Substitution

Application: Extract the specific functional mechanism of copper from the passage.

Final Logic: Cu ions $\rightarrow$ Suppress sperm motility.

🧠 Memory Trick

"Copper = Kill/Slow sperm."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Intra Uterine Devices –

19 Phagocytosis of sperms Phagocytosis of sperms caused by IUDs occurs specifically:

A In the fallopian tubes

B Within the uterus

C In the vagina

D In the ovaries

💡 Short Explanation

IUD stands for Intra-Uterine Device. It is placed in the uterus. The reaction (phagocytosis) happens at the site of placement.

✅ Correct Answer Explanation

As the name "Intra Uterine Device" implies, these are placed directly in the uterus. The foreign body response, which leads to increased white blood cell activity (phagocytosis), occurs locally within the uterine cavity.

❓ Why Other Options Are Incorrect

Options A, C, and D → Incorrect; these are outside the area of IUD influence.

🎯 Strategy

Used: Contextual/Tonal Matching

Application: Match the mechanism location with the name of the device (Intra Uterine).

Final Logic: Device in uterus = Site of action is uterus.

🧠 Memory Trick

"IUD = Uterus location."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Intra Uterine Devices –

20 The "fertilising capacity of sperms" is suppressed by IUDs primarily through:

A The physical barrier of the device

B The action of released Cu ions

C The complete absence of menstruation

D Surgical tying of the vas deferens

💡 Short Explanation

Suppression of fertilizing capacity is a chemical effect. Copper ions are the agents responsible. This specifically targets sperm viability.

✅ Correct Answer Explanation

The suppression of sperm motility and fertilizing capacity is a direct result of the copper ions ($Cu^{2+}$) released by specific types of IUDs (CuT, Cu7). These ions are toxic to sperm, effectively halting their movement and ability to fertilize an ovum.

❓ Why Other Options Are Incorrect

Option A → Incorrect; physical barrier is secondary to the chemical effect here.
Option C → Incorrect; IUDs do not stop menstruation.
Option D → Incorrect; this is a permanent surgical method (Vasectomy), not an IUD.

🎯 Strategy

Used: Substitution

Application: Connect the specific effect (suppression of fertilizing capacity) to its specific cause (Cu ions) as defined in the provided text.

Final Logic: Cu Ions = Reduced fertilizing capacity.

🧠 Memory Trick

"Cu Ions = Anti-Fertility."

📚 Class XII – Biology – Chapter: Reproductive Health – Topic: Intra Uterine Devices –

CUET UG Biology Booster Test 2 Population and Contraception

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