Primary spermatocytes $\xrightarrow[{{\rm{division}}}]{{{\rm{Meiotic}}}}$ secondary spermatocytes

Spermatogonia $\xrightarrow[{}]{{{\rm{Mitosis}}}}$ $\xrightarrow[{}]{{{\rm{Mitosis}}}}$ Sperms

Spermatogonium $\xrightarrow[{}]{{{\rm{Mitosis}}}}$ $\xrightarrow[{}]{{{\rm{Mitosis}}}}$ primary oocyte

Secondary spermatocytes $\xrightarrow[{{\rm{division}}}]{{{\rm{Mitotic}}}}$ spermatids

Rupture of hymen at the time of first coitus

Occurance of precocious pregnancy in woman

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NEET • BIOLOGY • HUMAN REPRODUCTION

Human reproduction practice · Mixed difficulty

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Showing 1-30 of 247 questions

1 Easy

1 of 247

Understanding +4 | -1

A regular cycling woman is not menstruating which one of the following is the most likely root cause of this?

View answer and explanation

Correct option: D

Fertilisation of the ovum

Option D (Fertilisation of the ovum) is correct because if a woman is not menstruating, the most likely reason is that she is pregnant due to fertilization of the ovum.

2 Medium

2 of 247

Understanding +4 | -1

Some important events in the human female reproductive cycle are given below. Arrange the events in proper sequence.
I.Secretion of FSH
II.Growth of cropus luteum
III.Growth of the follicle and oogenesis
IV.Ovulation
V.Sudden increase in the levels of LH

View answer and explanation

Correct option: B

I→III→V→IV→II

Option B (I→III→V→IV→II) is correct because it represents the correct sequence of events in the female reproductive cycle, starting with FSH secretion, follicle growth, LH surge, ovulation, and corpus luteum growth.

3 Hard

3 of 247

Remembering +4 | -1

Which cells produce the enzymes that allow embryonic implantation?

View answer and explanation

Correct option: A

Trophoblast

Option A is correct because trophoblast cells produce enzymes that allow the embryo to implant into the uterine wall.

4 Medium

4 of 247

Analyzing +4 | -1

Find out the mismatch from the following homologous organs.

View answer and explanation

Correct option: C

Vestibule – Penile urethra

Option C (Vestibule – Penile urethra) is the correct answer because the vestibule is a female structure, while the penile urethra is a male structure, and they are not homologous.

5 Medium

5 of 247

Understanding +4 | -1

In females, secondary oocyte completes meiosis II during

View answer and explanation

Correct option: C

Fusion of sperm with ovum

Option C is correct because in females, the secondary oocyte completes meiosis II during the fusion of sperm with the ovum (fertilization).

6 Hard

6 of 247

Remembering +4 | -1

Which type of immuno globin is/are abundantly found in foetus?

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Correct option: B

IgG

Option B (IgG) is correct because IgG is the only immunoglobulin that can cross the placenta, making it the most abundant immunoglobulin found in the fetus.

7 Easy

7 of 247

Understanding +4 | -1

Select right option

View answer and explanation

Correct option: C

Primary spermatocytes

\xrightarrow[{\mathrm{division}}]{{\mathrm{Meiotic}}}

secondary spermatocytes

Option C (Primary spermatocytes

\xrightarrow[{\mathrm{division}}]{{\mathrm{Meiotic}}}

secondary spermatocytes) is correct because primary spermatocytes undergo meiosis I to form secondary spermatocytes.

8 Medium

8 of 247

Analyzing +4 | -1

Assertion: Production of FSH increases, while that of LH decreases in the ovulation phase.
Reason: Due to decrease in the level of LH, ovulation (releasing of ova) takes place.

View answer and explanation

Correct option: C

If Assertion is true but Reason is false

Option C (If Assertion is true but Reason is false) is correct because FSH increases during the ovulation phase, while LH surges, leading to ovulation, not a decrease in LH.

9 Medium

9 of 247

Remembering +4 | -1

Corpus luteum release

View answer and explanation

Correct option: B

Progesterone

Option B (Progesterone) is correct because the corpus luteum primarily secretes progesterone, which is essential for maintaining the uterine lining during the luteal phase.

10 Easy

10 of 247

Understanding +4 | -1

Which of the following events is not associated with ovulation in human female?

View answer and explanation

Correct option: B

Decrease in estradiol

Option B is correct because a decrease in estradiol is NOT associated with ovulation; instead, there is a surge in estradiol leading up to the LH surge and ovulation.

11 Easy

11 of 247

Remembering +4 | -1

Seminal vesicles are present at the base of

View answer and explanation

Correct option: B

Bladder

Option B (Bladder) is correct because the seminal vesicles are located at the base of the bladder in males.

12 Medium

12 of 247

Understanding +4 | -1

…A… is made up of trophoblastic mesoderm inside and somatopleuric extraembryonic mesoderm outside. The space between embryo and the amnion is called …B… which is filled with clear watery fluid secreted by both embryo and membrane. It protects the embryo from shock and desiccation. A and B in above sentence are

View answer and explanation

Correct option: B

A-Amnion; B-Amniotic cavity

Option B (A-Amnion; B-Amniotic cavity) is correct because the amnion is made up of trophoblastic mesoderm inside and somatopleuric extraembryonic mesoderm outside, and the space between the embryo and amnion is the amniotic cavity.

13 Medium

13 of 247

Understanding +4 | -1

Which of the following is a role of Sertoli cells in spermatogenesis?

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Correct option: D

They provide nutrition to developing sperm; they direct morphogenesis of sperm

Option D (They provide nutrition to developing sperm; they direct morphogenesis of sperm) is correct because Sertoli cells provide both nutritional support and guidance during sperm development.

14 Easy

14 of 247

Remembering +4 | -1

The main function of fimbriae of Fallopian tube is

View answer and explanation

Correct option: B

Help in collection of the ovum after ovulation

Option B (Help in collection of the ovum after ovulation) is correct because the fimbriae are finger-like projections that sweep the ovulated oocyte from the ovary into the fallopian tube.

15 Hard

15 of 247

Understanding +4 | -1

Which is an incorrect statement :

(a) Testicular lobules are not seperated in the testis.

(b) Glanspenis is covered by labia.

(c) Heart is formed during the third trimester of gestation.

(d) Mitochondria in sperms is present just behind the acrosome.

View answer and explanation

Correct option: D

a, b, c & d

Option D (a, b, c & d) is correct because all the statements are incorrect. Testicular lobules are separated, glans penis is covered by prepuce, heart is formed during the first trimester, and mitochondria are located in the midpiece of the sperm.

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16 Medium

16 of 247

Application +4 | -1

Assume

2 \mathrm{n}=12

in a hypothetical species. In gametogenesis, the number of chromosomes in a spermatid would be _____ and in a first polar body would be ______.

View answer and explanation

Correct option: D

6,6

Option D (6,6) is correct because in a species with 2n=12, a spermatid (after meiosis II) has n=6 chromosomes, and the first polar body (after meiosis I) also has n=6 chromosomes.

17 Easy

17 of 247

Remembering +4 | -1

Neubenkern is a part to

View answer and explanation

Correct option: C

Human sperm

The correct answer is C (Human sperm) because the nebenkern is a structure formed from mitochondria in developing sperm cells.

18 Hard

18 of 247

Remembering +4 | -1

The endometrium is found in

View answer and explanation

Correct option: C

Uterus of mammals

Option C is correct because the endometrium is the inner lining of the uterus in mammals.

19 Medium

19 of 247

Understanding +4 | -1

If the size of a fertilized egg of frog is compared with the size of its blastula and gastrula stages, which of the following observations will be correct?

View answer and explanation

Correct option: D

Gastrula will be larger, while zygote and blastula will be of same size

Option B (All the three will be of the same size) is correct because cleavage divisions during blastula and gastrula stages are characterized by no significant growth in overall size, only an increase in cell number.

20 Medium

20 of 247

Understanding +4 | -1

A cross section at the midpoint of the middle piece of a human sperm will show

View answer and explanation

Correct option: C

mitochondria and 9+2 arrangement of microtubules

Option C (mitochondria and 9+2 arrangement of microtubules) is correct because the midpiece of the sperm contains mitochondria for energy and the 9+2 microtubule arrangement of the axoneme.

21 Easy

21 of 247

Remembering +4 | -1

Vasa efferentia are the ductules leading from

View answer and explanation

Correct option: B

rete testes to vas deferens

Option B (rete testes to vas deferens) is correct because the vasa efferentia are small ducts that connect the rete testis to the epididymis, which then leads to the vas deferens.

22 Easy

22 of 247

Understanding +4 | -1

Which area experiences the greatest change during the menstrual cycle?

View answer and explanation

Correct option: D

Endometrium

Option D (Endometrium) is correct because the endometrium undergoes the most significant changes during the menstrual cycle in preparation for implantation.

23 Medium

23 of 247

Remembering +4 | -1

Ovaries are the …A… sex organs which produce ovum and several steroid hormone called …B… Here A and B refers to

View answer and explanation

Correct option: C

A-primary; B-ovarian hormones

Option C (A-primary; B-ovarian hormones) is correct because ovaries are the primary sex organs in females, producing ova and ovarian hormones like estrogen and progesterone.

24 Easy

24 of 247

Understanding +4 | -1

The function of ovary is
(A) To produce female gamete (B) To provide the site of fertilization (C) To provide the site of implantation (D) To produce several steroid hormones

View answer and explanation

Correct option: D

A and D

Option D (A and D) is correct because the ovary produces female gametes (ova) and several steroid hormones like estrogen and progesterone.

25 Easy

25 of 247

Understanding +4 | -1

Which one of the following events is correctly matched with the time period in a normal menstrual cycle?

View answer and explanation

Correct option: B

Endometrium regenerates - 5 -14 days

Option B (Endometrium regenerates - 5 -14 days) is correct because the endometrium rebuilds during the follicular phase, typically from days 5 to 14.

26 Medium

26 of 247

Application +4 | -1

A female having menstrual cycle of 34 days will have ovulation at:

View answer and explanation

Correct option: D

20th day

Option D (20th day) is correct because ovulation typically occurs 14 days before the start of the next menstrual period. With a 34-day cycle, 34 - 14 = 20.

27 Easy

27 of 247

Remembering +4 | -1

Menarche is

View answer and explanation

Correct option: A

Rupture of endometrial lining of uterus for the first time in puberty of a girl

Option A (Rupture of endometrial lining of uterus for the first time in puberty of a girl) is correct because menarche refers to the first occurrence of menstruation in a female during puberty.

28 Hard

28 of 247

Remembering +4 | -1

Given below are two statements

Statement I:
The labia minora are paired folds of tissue under the labia majora.

Statement II :
The clitoris is a tiny finger like structure which lies at the upper junction of the two labia minora above the Urethral opening.

Choose the correct answer from the option given below:

View answer and explanation

Correct option: D

Both Statement I and Statement II are correct

Option D (Both Statement I and Statement II are correct) is correct because both statements accurately describe the anatomy of the female external genitalia.

29 Medium

29 of 247

Analyzing +4 | -1

Which of the following statements are true for spermatogenesis but do not hold true for Oogenesis?
(a) It results in the formation of haploid gametes
(b) Differentiation of gamete occurs after the completion of meiosis
(c) Meiosis occurs continuously in a mitotically dividing stem cell population
(d) It is controlled by the Luteinising hormone (LH) and Follicle Stimulating Hormone (FSH) secreted by the anterior pituitary
(e) It is initiated at puberty
Choose the most appropriate answer from the options given below:

View answer and explanation

Correct option: A

(b), (c) and (e) only

Option A ((b), (c) and (e) only) is correct because in spermatogenesis, differentiation occurs after meiosis, meiosis occurs continuously, and it is initiated at puberty. These statements are not true for oogenesis.

30 Easy

30 of 247

Understanding +4 | -1

Most mammals have their testis sac called scrotal sac which is for

View answer and explanation

Correct option: D

Temperature regulation

Option D (Temperature regulation) is correct because the scrotal sac maintains a temperature slightly lower than body temperature, which is essential for spermatogenesis.

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Key Takeaways

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