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NEET • BIOLOGY • HUMAN REPRODUCTION
Human reproduction practice · Hard
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Showing 1-30 of 56 questions
1
Hard
1 of 56
Remembering
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Which cells produce the enzymes that allow embryonic implantation?
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Correct option: A
Trophoblast
Option A is correct because trophoblast cells produce enzymes that allow the embryo to implant into the uterine wall.
2
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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.
3
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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.
(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.
4
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Remembering
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The endometrium is found in
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Correct option: C
Uterus of mammals
Option C is correct because the endometrium is the inner lining of the uterus in mammals.
5
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Remembering
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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:
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.
6
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In case of pregnancy the heartbeat of embryo
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Correct option: C
6th week
Option C (6th week) is correct because the fetal heartbeat typically becomes detectable around the 6th week of gestation using ultrasound.
7
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Relaxin hormone is secreted by
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Correct option: B
Corpus luteum at the end of gestation
Option B is correct because relaxin is secreted by the corpus luteum at the end of gestation to relax the pelvic ligaments and prepare for childbirth.
8
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Remembering
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A human female is born with a million of primary follicles at the time of birth. At puberty, only 60,000-80,000
primary follicles are left in each ovary. What happens to the rest of the primary follicles?
primary follicles are left in each ovary. What happens to the rest of the primary follicles?
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Correct option: A
They degenerate
Option A (They degenerate) is correct because the majority of primary follicles undergo atresia (degeneration) before puberty.
9
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Remembering
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Gonads are derived from
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Correct option: B
mesoderm
Option B (mesoderm) is correct because the gonads (ovaries and testes) develop from the intermediate mesoderm during embryonic development.
10
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The placenta of human beings belongs to the category of:
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Correct option: D
Haemochorial
Option D is correct because the human placenta is classified as haemochorial, where the maternal blood is in direct contact with the chorion.
11
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Remembering
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The follicle that ruptures at the time of ovulation promptly fills with blood forming:
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Correct option: A
Corpus haemorrhagium
Option A (Corpus haemorrhagium) is correct because immediately after ovulation, the ruptured follicle fills with blood, forming the corpus haemorrhagicum.
12
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Understanding
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Exact definition of gastrulation is:
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Correct option: C
Morphogenetic movements of blastomeres (presumptive areas)
Option C (Morphogenetic movements of blastomeres (presumptive areas)) is correct because gastrulation is characterized by the rearrangement and movement of cells, leading to the formation of germ layers.
13
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Remembering
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Human zygote is a
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Correct option: A
Totipotent cell
Option A is correct because a human zygote is totipotent, meaning it has the potential to develop into any cell type in the body.
14
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Remembering
+4 | -1
Orchidectomy is surgical removal of
View answer and explanation
Correct option: A
Testes
Option A (Testes) is correct because orchidectomy is the surgical removal of one or both testes, typically performed to treat testicular cancer or other testicular conditions.
15
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Understanding
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Level of progesterone is highest
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Correct option: C
7 days after ovulation
Option C (7 days after ovulation) is correct because progesterone levels peak in the luteal phase, approximately 7 days after ovulation, due to the corpus luteum.
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16
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Understanding
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Assertion (A): Clitoris of female is homologous to penis.
Reason (R): Both have same origin and richly supplied with nerves and blood vessels.
Reason (R): Both have same origin and richly supplied with nerves and blood vessels.
View answer and explanation
Correct option: A
Both A and R are true and R is the correct
explanation of A
explanation of A
Option A (Both A and R are true and R is the correct explanation of A) is correct because the clitoris and penis are homologous structures with the same origin and rich nerve and blood vessel supply.
17
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Understanding
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Given below are two statements.
Statement I: Increased level of several hormones in human maternal
blood are necessary for maintainence of pregnancy.
Statement II: In human female Immediately after implantation the
inner cell mass (embryo) differentiates into an outer
layer ectoderm and an inner layer called endoderm.
Choose the correct answer from the option given below:
Statement I: Increased level of several hormones in human maternal
blood are necessary for maintainence of pregnancy.
Statement II: In human female Immediately after implantation the
inner cell mass (embryo) differentiates into an outer
layer ectoderm and an inner layer called endoderm.
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 hormonal changes during pregnancy and early embryonic development.
18
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Understanding
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The process of spermatogenesis involves a series of steps that results in the formation of mature sperm. What cells are released after the completion of the multiplication stage?
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Correct option: A
Spermatids
Option D (Spermatogonia) is correct because spermatogonia are the cells that undergo mitosis during the multiplication phase of spermatogenesis, and they are released after this stage.
19
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Remembering
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Gestation period of cats is approximately equal to the gestation period of
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Correct option: C
Dogs
Option C (Dogs) is correct because the gestation period for both cats and dogs is approximately 63 days (around 9 weeks).
20
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Remembering
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Mammary glands are found in:
View answer and explanation
Correct option: D
All the above
Option D (All the above) is correct because mammary glands are a characteristic feature of mammals, and all the listed animals (Pteropus, Balaenoptera, Ornithorhynchus) are mammals.
21
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Understanding
+4 | -1
The functions of male accessory duct and glands are maintained by :
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Correct option: C
Androgens
Option C (Androgens) is correct because androgens, particularly testosterone, are the primary hormones responsible for maintaining the function of male accessory ducts and glands.
22
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Understanding
+4 | -1
During cleavage, there is an increase in all of the following, except
View answer and explanation
Correct option: B
Size of blastomeres
Option B (Size of blastomeres) is correct because during cleavage, the size of blastomeres decreases as the zygote divides into smaller and smaller cells, while the number of blastomeres, nuclear-cytoplasmic ratio, and DNA content increase.
23
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Understanding
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Reductional division during oogenesis starts in
View answer and explanation
Correct option: B
Primary oocyte within primary follicle
Option B (Primary oocyte within primary follicle) is correct because the primary oocyte begins meiosis I within the primary follicle, but the process is arrested at prophase I until puberty.
24
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Remembering
+4 | -1
Capacitation of sperms, in humans occurs in
View answer and explanation
Correct option: B
Female genital tract
Option B is correct because capacitation of sperm occurs in the female genital tract, enabling it to fertilize the egg.
25
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Remembering
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Gastrulation means
View answer and explanation
Correct option: B
Formation of 3 germ layers
Option B (Formation of 3 germ layers) is correct because gastrulation is the process where the blastula reorganizes into a three-layered structure: ectoderm, mesoderm, and endoderm.
26
Hard
26 of 56
Remembering
+4 | -1
The longest visceral muscle cell is present in
View answer and explanation
Correct option: C
Pregnant uterus
Option C (Pregnant uterus) is correct because during pregnancy, the uterine smooth muscle cells (myometrium) undergo hypertrophy and hyperplasia, leading to a significant increase in size, making them the longest visceral muscle cells.
27
Hard
27 of 56
Understanding
+4 | -1
The sperm and the egg make different contributions to zygote. Which of the following statements about their contributions are there?
i) Sperm contributes most of the mitochondria
ii) Egg contributes most of the cytoplasm
iii) Both sperm and egg contribute haploid nucleus
iv) Both sperm and egg contribute centrioles
i) Sperm contributes most of the mitochondria
ii) Egg contributes most of the cytoplasm
iii) Both sperm and egg contribute haploid nucleus
iv) Both sperm and egg contribute centrioles
View answer and explanation
Correct option: B
(ii) and (iii)
Option B ((ii) and (iii)) is correct because the egg contributes most of the cytoplasm and both sperm and egg contribute a haploid nucleus to form the diploid zygote.
28
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28 of 56
Understanding
+4 | -1
Number of chromosomes present in secondary spermatocyte is
View answer and explanation
Correct option: B
23
Option B (23) is correct because secondary spermatocytes are haploid cells, containing half the number of chromosomes as the diploid primary spermatocytes.
29
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29 of 56
Understanding
+4 | -1
Polyspermy is prevented by all the events, except
View answer and explanation
Correct option: D
No Sodium gates in the egg membrane getting closed
Option D (No Sodium gates in the egg membrane getting closed) is correct because the closure of sodium channels is not a direct mechanism to prevent polyspermy. The fast block to polyspermy involves electrical changes due to influx of sodium ions, but the long-term block involves the cortical reaction and zona reaction.
30
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30 of 56
Remembering
+4 | -1
The formation of gametes is termed as
View answer and explanation
Correct option: C
Gametogenesis
Option C (Gametogenesis) is correct because gametogenesis is the process of forming gametes (sperm in males and eggs in females) through meiosis.
Revision notes and key takeaways
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Key Takeaways
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