CUET UG Categorised PYQ Biology Unit 2 -

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CUET UG Categorised PYQ Biology Unit 2

BIOLOGY

⏱️ 30 Minutes

❓ 19 Questions

📅 2022, 2023, 2024 & 2025

✍️ Long Answers

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

CUET UG Categorised PYQ Biology Unit 2

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QUESTION 1 OF 19

Which of the following hormone is not produced by placenta? (PYQ 2022 Shift 1)

Answer Review

1 Which of the following hormone is not produced by placenta? (PYQ 2022 Shift 1)

A hCG

B hPL

C estrogen

D androgens

💡 Short Explanation

Placenta secretes hCG. Placenta secretes hPL and estrogen. Androgens are not placental hormones.

✅ Correct Answer Explanation

Placenta functions as an endocrine organ and secretes hCG, hPL, estrogens and progesterone. Androgens are not listed among the principal placental hormones in NCERT.

❓ Why Other Options Are Incorrect

Option A) hCG → Placental hormone.
Option B) hPL → Placental hormone.
Option C) estrogen → Produced by placenta during pregnancy.

🎯 Strategy

Used: NCERT Recall

Option A → Placental.
Option B → Placental.
Option C → Placental.
Option D → Correct.

Final Answer → Androgens.

🧠 Memory Trick

📚 → Section/Theme: Placenta and Pregnancy

2 Match List – I with List – II (PYQ 2022 Shift 1)

List – I	List – II
(A) Prostate gland	(I) Store and transport sperms
(B) Leydig cells	(II) Male external genitalia
(C) Ejaculatory duct	(III) Male accessory gland
(D) Penis	(IV) Testicular hormones

A (A) - (III), (B) - (IV), (C) - (I), (D) - (II)

B (A) - (IV), (B) - (III), (C) - (I), (D) - (II)

C (A) - (I), (B) - (III), (C) - (IV), (D) - (II)

D (A) - (IV), (B) - (II), (C) - (III), (D) - (I)

💡 Short Explanation

Prostate = Accessory gland. Leydig cells produce hormones. Ejaculatory duct transports sperms. Penis is external genitalia.

✅ Correct Answer Explanation

Correct matching: Prostate gland → Male accessory gland. Leydig cells → Testicular hormones. Ejaculatory duct → Store and transport sperms. Penis → Male external genitalia.

❓ Why Other Options Are Incorrect

Option B) Prostate and Leydig cells interchanged.
Option C) Multiple mismatches.
Option D) Multiple mismatches.

🎯 Strategy

Used: Option Grouping

Option A → Correct.
Option B → Incorrect.
Option C → Incorrect.
Option D → Incorrect.

Final Answer → Option A.

🧠 Memory Trick

📚 → Section/Theme: Male Reproductive System

3 Sequentially arrange the developmental stages of human spermatozoon: (PYQ 2022 Shift 1)
(A) Secondary Spermatocyte
(B) Spermatid
(C) Spermatozoa
(D) Spermatogonia
(E) Primary spermatocytes

A (E), (A), (D), (B), (C)

B (E), (A), (D), (C), (B)

C (E), (A), (C), (D), (B)

D (D), (E), (A), (B), (C)

💡 Short Explanation

Spermatogonia divide mitotically. Primary and secondary spermatocytes form. Spermatids transform into spermatozoa.

✅ Correct Answer Explanation

The sequence of spermatogenesis is: Spermatogonia → Primary Spermatocyte → Secondary Spermatocyte → Spermatid → Spermatozoa Hence D → E → A → B → C.

❓ Why Other Options Are Incorrect

Option A) Spermatogonia should come first.
Option B) Incorrect order.
Option C) Spermatozoa cannot form before spermatids.

🎯 Strategy

Used: Sequential Logic

Option A → Incorrect sequence.
Option B → Incorrect sequence.
Option C → Incorrect sequence.
Option D → Correct sequence.

Final Answer → Option D.

🧠 Memory Trick

📚 → Section/Theme: Spermatogenesis

4 Which part of the sperm help in its entry into the cytoplasm of the ovum? (PYQ 2022 Shift 1)

A Plasma membrane

B Nucleus

C Neck

D Acrosome

💡 Short Explanation

Acrosome contains hydrolytic enzymes. Helps penetrate egg coverings. Essential for fertilization.

✅ Correct Answer Explanation

The acrosome is a cap-like structure on the sperm head containing enzymes such as hyaluronidase. These enzymes digest egg coverings and facilitate sperm entry into the ovum.

❓ Why Other Options Are Incorrect

Option A) Does not digest egg coverings.
Option B) Contains genetic material.
Option C) Connects head and middle piece.

🎯 Strategy

Used: NCERT Recall

Option A → Structural role.
Option B → Genetic role.
Option C → Connecting region.
Option D → Fertilization role.

Final Answer → Acrosome.

🧠 Memory Trick

📚 → Section/Theme: Structure of Sperm

5 The process of transformation of spermatids into spermatozoa is known as: (PYQ 2023 Shift 1)

A Spermiogenesis

B Spermatogenesis

C Spermiation

D Spermation

💡 Short Explanation

Spermatid → Spermatozoa. Final maturation step. Occurs in seminiferous tubules.

✅ Correct Answer Explanation

Spermiogenesis refers specifically to the transformation of spermatids into mature spermatozoa. During this process, tail formation, nuclear condensation and acrosome development occur.

❓ Why Other Options Are Incorrect

Option B) Spermatogenesis → Entire sperm formation process.
Option C) Spermiation → Release of spermatozoa from Sertoli cells.
Option D) Spermation → Incorrect biological term.

🎯 Strategy

Used: Contextual/Tonal Matching

Option A → Specific maturation step.
Option B → Complete process.
Option C → Release process.
Option D → Invalid term.

Final Answer → Spermatid to spermatozoa = Spermiogenesis.

🧠 Memory Trick

📚 → Section/Theme: Spermatogenesis

6 Arrange the following events of human embryo development in a correct sequence: (PYQ 2023 Shift 1)

A C, D, B, A

B D, C, A, B

C D, B, C, A

D A, C, D, B

💡 Short Explanation

Cleavage begins first. Morula forms next. Blastocyst develops. Implantation occurs last.

✅ Correct Answer Explanation

The zygote first undergoes cleavage divisions. These divisions produce the morula stage. The morula develops into a blastocyst, which subsequently implants into the uterine wall.

❓ Why Other Options Are Incorrect

Option A → Morula cannot form before cleavage.
Option C → Implantation occurs after blastocyst formation.
Option D → Sequence completely reversed.

🎯 Strategy

Used: Contextual/Tonal Matching

Option A → Incorrect chronology.
Option B → Correct developmental order.
Option C → Implantation too early.
Option D → Reverse sequence.

Final Answer → D → C → A → B.

🧠 Memory Trick

📚 → Section/Theme: Embryonic Development

7 Which of the following hormone is not secreted by placenta ? (PYQ 2023 Shift 2)

A Estrogens

B Progesterones

C Relaxin

D Human chorionic gonadotropin

💡 Short Explanation

Placenta secretes hCG. Placenta secretes estrogen and progesterone. Relaxin is mainly secreted by ovary initially.

✅ Correct Answer Explanation

According to NCERT, placenta secretes hCG, hPL, estrogens and progesterone. Relaxin is mainly secreted by the ovary during pregnancy and later by placenta in advanced pregnancy; therefore NCERT-based answer is Relaxin.

❓ Why Other Options Are Incorrect

Option A) Placental hormone.
Option B) Placental hormone.
Option D) Placental hormone.

🎯 Strategy

Used: NCERT Recall

Option A → Placental.
Option B → Placental.
Option C → Expected answer.
Option D → Placental.

Final Answer → Relaxin.

🧠 Memory Trick

📚 → Section/Theme: Pregnancy and Placenta

8 Which one of the following is NOT the function of Leydig cells ? (PYQ 2023 Shift 2)

A Synthesis Androgens

B Secretes Androgens

C Immunologically competent cells are present in it

D Stimulate secretion of some factors which help in the process of Spermiogenesis

💡 Short Explanation

Leydig cells synthesize androgens. Androgens support spermatogenesis. Immunological cells are unrelated.

✅ Correct Answer Explanation

Leydig cells are interstitial cells that synthesize and secrete androgens such as testosterone. Immunologically competent cells are lymphocytes and are not a function of Leydig cells.

❓ Why Other Options Are Incorrect

Option A) Correct Leydig function.
Option B) Correct Leydig function.
Option D) Testosterone supports spermiogenesis.

🎯 Strategy

Used: Odd One Out

Option A → Leydig role.
Option B → Leydig role.
Option C → Not Leydig function.
Option D → Related to androgens.

Final Answer → Option C.

🧠 Memory Trick

📚 → Section/Theme: Male Reproductive System

9 In which of the following mammals the menstrual cycle occurs? (PYQ 2023 Shift 3)

A Ape

B Dog

C Rats

D Sheep

💡 Short Explanation

Menstrual cycle occurs in primates. Apes are primates. Dogs, rats and sheep show estrous cycle.

✅ Correct Answer Explanation

Menstrual cycles are characteristic of primates such as monkeys, apes and humans. In these mammals, if fertilization does not occur, the endometrium is shed as menstrual flow. Dogs, rats and sheep exhibit estrous cycles instead of menstrual cycles.

❓ Why Other Options Are Incorrect

Option B) Dog → Shows estrous cycle.
Option C) Rats → Shows estrous cycle.
Option D) Sheep → Shows estrous cycle.

🎯 Strategy

Used: Odd One Out

Option A → Primate.
Option B → Estrous cycle.
Option C → Estrous cycle.
Option D → Estrous cycle.

Final Answer → Ape.

🧠 Memory Trick

📚 → Section/Theme: Menstrual Cycle

10 Which of the following statements are correct with respect to reproduction in human? (PYQ 2023 Shift 3)

A A, B only

B B, C only

C A, D only

D B, D only

💡 Short Explanation

Pregnancy stops menstruation. Zona pellucida surrounds secondary oocyte. Leydig cells are in testes. Androgens are produced by Leydig cells.

✅ Correct Answer Explanation

Statement A is correct because menstruation ceases during pregnancy. Statement D is correct because zona pellucida is a non-cellular glycoprotein layer around the secondary oocyte. Statements B and C are incorrect because Leydig cells are found in testes and produce androgens.

❓ Why Other Options Are Incorrect

Option A) Includes incorrect statement B.
Option B) Both statements incorrect.
Option D) Includes incorrect statement B.

🎯 Strategy

Used: Elimination

Option A → B incorrect.
Option B → Both incorrect.
Option C → Correct pair.
Option D → B incorrect.

Final Answer → Option C.

🧠 Memory Trick

📚 → Section/Theme: Reproductive System

11 Which of the following hormones acts on the uterine muscles and causes strong uterine contractions during foetal ejection reflex? (PYQ 2023 Shift 3)

A hCG

B hPL

C Relaxin

D Oxytocin

💡 Short Explanation

Released from posterior pituitary. Stimulates uterine contractions. Essential during childbirth.

✅ Correct Answer Explanation

Oxytocin acts on uterine muscles and induces strong contractions during parturition. These contractions become progressively stronger through positive feedback during foetal ejection reflex.

❓ Why Other Options Are Incorrect

Option A) Maintains corpus luteum.
Option B) Human placental lactogen.
Option C) Relaxes pelvic ligaments.

🎯 Strategy

Used: NCERT Recall

Option A → Pregnancy maintenance.
Option B → Placental hormone.
Option C → Pelvic relaxation.
Option D → Labour hormone.

Final Answer → Oxytocin.

🧠 Memory Trick

📚 → Section/Theme: Parturition

📄 Passage

The reproductive cycle of female primates is called menstrual cycle. Menstrual cycle starts only after attaining sexual maturation (puberty). Generally, during ovulation only one ovum is released per menstrual cycle. The cyclical changes in the ovary and the uterus during menstrual cycle are induced by changes in the levels of pituitary and ovarian hormones. After coitus, sperms are transported to the junction of the isthmus and ampulla, where the sperm fertilises the ovum leading to formation of a diploid zygote.

Question:
Which of the following does not constitute accessory duct of female reproductive system ? (PYQ 2024 Shift 1)

A Fallopian tubes

B Uterus

C Cervix

D Vagina

💡 Short Explanation

Female accessory ducts include oviducts, cervix and vagina. Uterus is an organ. Not classified as an accessory duct.

✅ Correct Answer Explanation

The female accessory ducts are the fallopian tubes, cervix and vagina. The uterus is the main reproductive organ where implantation and foetal development occur and is not categorized as an accessory duct.

❓ Why Other Options Are Incorrect

Option A → Accessory duct.
Option C → Accessory duct.
Option D → Accessory duct.

🎯 Strategy

Used: Odd One Out

Option A → Duct.
Option B → Organ.
Option C → Duct.
Option D → Duct.

Final Answer → Uterus.

🧠 Memory Trick

📚 → Class 12 Biology, Chapter 3: Human Reproduction.

📄 Passage

Question:
The female external genitalia include : (PYQ 2024 Shift 1)
(A) Mons pubis
(B) Hymen
(C) Mammary ducts
(D) Clitoris
(E) Cervix

A (A), (C) and (D) only

B (B), (D) and (E) only

C (A), (B) and (D) only

D (C), (D) and (E) only

💡 Short Explanation

External genitalia collectively form vulva. Mons pubis, hymen and clitoris are external. Mammary ducts and cervix are not.

✅ Correct Answer Explanation

The female external genitalia include mons pubis, labia majora, labia minora, hymen and clitoris. Mammary ducts belong to mammary glands, while cervix is an internal reproductive structure.

❓ Why Other Options Are Incorrect

Option A → Includes mammary ducts.
Option B → Includes cervix.
Option D → Includes mammary ducts and cervix.

🎯 Strategy

Used: Elimination

Option A → Contains non-genital structure.
Option B → Contains internal structure.
Option C → All correct.
Option D → Contains two incorrect structures.

Final Answer → Option C.

🧠 Memory Trick

📚 → Class 12 Biology, Chapter 3: Human Reproduction.

📄 Passage

Question:
Select the organ of female reproductive system where the sperm is not transported at the time of coitus: (PYQ 2024 Shift 1)

A Cervix

B Ovary

C Uterus

D Fallopian tube

💡 Short Explanation

Sperm travels through reproductive tract. Ovary produces ova. Sperm does not enter ovary.

✅ Correct Answer Explanation

During coitus, sperm enters the vagina and travels through the cervix, uterus and fallopian tube. The ovary is not part of the sperm transport pathway.

❓ Why Other Options Are Incorrect

Option A → Sperm passes through cervix.
Option C → Sperm passes through uterus.
Option D → Fertilization occurs in fallopian tube.

🎯 Strategy

Used: Elimination

Option A → Transport pathway.
Option B → Not transport pathway.
Option C → Transport pathway.
Option D → Transport pathway.

Final Answer → Ovary.

🧠 Memory Trick

📚 → Class 12 Biology, Chapter 3: Human Reproduction.

📄 Passage

Question:
Which of the following does not take place before ovulation in human female ? (PYQ 2024 Shift 1)

A The secretion of LH and FSH increases during follicular phase.

B The corpus luteum secretes large amounts of progesterone.

C LH and FSH attains a peak level in the middle of the cycle.

D Maximum secretion of LH induces rupture of Graafian follicle.

💡 Short Explanation

Corpus luteum forms after ovulation. Progesterone rises after ovulation. Therefore not a pre-ovulation event.

✅ Correct Answer Explanation

The corpus luteum develops only after rupture of the Graafian follicle during ovulation. It secretes progesterone during the luteal phase. Therefore this event occurs after ovulation, not before it.

❓ Why Other Options Are Incorrect

Option A → Occurs before ovulation.
Option C → Mid-cycle surge triggers ovulation.
Option D → Directly responsible for ovulation.

🎯 Strategy

Used: Contextual/Tonal Matching

Option A → Follicular phase event.
Option B → Luteal phase event.
Option C → Ovulation trigger.
Option D → Ovulation mechanism.

Final Answer → Option B.

🧠 Memory Trick

📚 → Class 12 Biology, Chapter 3: Human Reproduction, Menstrual Cycle.

16 Match the following: (PYQ 2024 Shift 1)

List-I	List-II
A. Proliferative phase	I. 14th day
B. Menstrual phase	II. 15th–28th/29th days
C. Secretory phase	III. 1st–5th days
D. Ovulatory phase	IV. 5th–13th days

A (A)-(II), (B)-(IV), (C)-(III), (D)-(I)

B (A)-(III), (B)-(II), (C)-(I), (D)-(IV)

C (A)-(IV), (B)-(III), (C)-(II), (D)-(I)

D (A)-(II), (B)-(IV), (C)-(I), (D)-(III)

💡 Short Explanation

Menstrual: 1–5 days. Proliferative: 5–13 days. Ovulation: 14th day.

✅ Correct Answer Explanation

Correct matching: Proliferative phase → 5th–13th days Menstrual phase → 1st–5th days Secretory phase → 15th–28th/29th days Ovulatory phase → 14th day Hence Option C.

❓ Why Other Options Are Incorrect

Option A → Proliferative and secretory phases mismatched.
Option B → Multiple incorrect pairings.
Option D → Incorrect secretory and proliferative assignments.

🎯 Strategy

Used: Option Grouping

Option A → Incorrect.
Option B → Incorrect.
Option C → Correct matching.
Option D → Incorrect.

Final Answer → Option C.

🧠 Memory Trick

📚 → Class 12 Biology, Chapter 3: Human Reproduction.

17 Arrange the following events in the correct order pertaining to fertilization in the human reproductive system: (PYQ 2025 Shift 1)

A (D), (C), (A), (B)

B (A), (C), (B), (D)

C (B), (A), (D), (C)

D (C), (B), (D), (A)

💡 Short Explanation

Morula forms first. Blastocyst develops. Implantation occurs. Chorionic villi appear.

✅ Correct Answer Explanation

After fertilization, the zygote undergoes cleavage and forms a morula (D). The blastomeres then differentiate into trophoblast and inner cell mass (C). The blastocyst becomes implanted in the endometrium (A). Following implantation, trophoblast develops finger-like chorionic villi (B) that help in placental formation.

❓ Why Other Options Are Incorrect

Option B
Implantation cannot occur before blastocyst formation.
Option C
Chorionic villi develop after implantation.
Option D
Differentiation into trophoblast occurs after morula stage.

🎯 Strategy

Used: Sequential Biology Process

Option A → Correct developmental sequence.
Option B → Implantation placed too early.
Option C → Incorrect chronology.

Final Answer → Based on developmental order.

🧠 Memory Trick

Morula → Blastocyst → Implantation → Villi

📚 Class 12 Biology – Chapter 3: Human Reproduction – Fertilization and Implantation

18 Which of the following is the primary female sex organ? (PYQ 2025 Shift 1)

A Mammary glands

B Uterus

C Ovaries

D Cervix

💡 Short Explanation

Produce ova. Secrete estrogen and progesterone. Primary reproductive organs.

✅ Correct Answer Explanation

Ovaries are the primary female reproductive organs. They produce female gametes (ova) and secrete reproductive hormones such as estrogen and progesterone. These hormones regulate the menstrual cycle and reproductive functions.

❓ Why Other Options Are Incorrect

A) Mammary glands
Accessory reproductive structures.
B) Uterus
Site of embryo development.
D) Cervix
Lower portion of the uterus.

🎯 Strategy

Used: NCERT Recall

Option A → Accessory organ.
Option B → Secondary reproductive structure.
Option C → Primary gonad.

Final Answer → Based on NCERT recall.

🧠 Memory Trick

Ovary = Ovum Producer

📚 Class 12 Biology, Chapter 3 – Human Reproduction, Female Reproductive System

19 Which one of the following structure is haploid (n) in relation to male reproductive system? (PYQ 2025 Shift 1)

A Secondary spermatocytes

B Primary spermatocytes

C Leydig cells

D Sertoli cells

💡 Short Explanation

Meiosis I produces secondary spermatocytes. They contain haploid chromosome number. Other cells are diploid.

✅ Correct Answer Explanation

Primary spermatocytes undergo meiosis I to form secondary spermatocytes. After meiosis I, the chromosome number is reduced from diploid (2n) to haploid (n). Leydig cells and Sertoli cells are somatic cells and remain diploid throughout life.

❓ Why Other Options Are Incorrect

B) Primary spermatocytes
Diploid cells before meiosis I.
C) Leydig cells
Hormone-producing diploid cells.
D) Sertoli cells
Supporting diploid cells.

🎯 Strategy

Used: NCERT Recall

Option A → Haploid after meiosis I.
Option B → Diploid stage.
Option C → Somatic cell.

Final Answer → Based on spermatogenesis.

🧠 Memory Trick

Secondary = Second Stage After Meiosis = Haploid

📚 Class 12 Biology, Chapter 3 – Human Reproduction, Spermatogenesis

CUET UG Categorised PYQ Biology Unit 2

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