NEET Biology Human Reproduction MCQs Set 25

Multiple Choice Questions (MCQs) for NEET Biology: Human Reproduction

Access targeted multiple-choice questions for Human Reproduction designed to align with the latest NEET academic syllabus for NEET Biology. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

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Multiple Choice Questions

Question 1: Which part of the spermatid forms the acrosome of the sperm?
(a) Mitochondria
(b) Golgi body
(c) Nucleus
(d) Lysosome
Show Answer & Explanation

Answer: (b) Golgi body

Explanation:
1. Golgi vesicles fuse to form the acrosomal cap.

Teacher's Note:
1. The acrosome is considered a modified lysosome.
2. Mitochondria form the Nebenkern.

Question 2: The thin cytoplasmic layer present in the middle part of the sperm is called
(a) Nebenkern
(b) Manchette
(c) Axial filament
(d) Zensen ring
Show Answer & Explanation

Answer: (b) Manchette

Explanation:
1. The manchette is a thin cytoplasmic sheath that surrounds the middle piece.

Teacher's Note:
1. Do not confuse with the Nebenkern.
2. It is part of the sperm structure.

Question 3: Which vitamins are essential for gametogenesis?
(a) Vitamin A and E
(b) Vitamin C and D
(c) Vitamin E and K
(d) Vitamin E and B complex
Show Answer & Explanation

Answer: (a) Vitamin A and E

Explanation:
1. Vitamin A and E are needed for normal spermatogenesis and oogenesis.

Teacher's Note:
1. Vitamin E is the anti-sterility vitamin.
2. Deficiency causes sterility.

Question 4: Which of the following is responsible for the division of the fertilized egg?
(a) Centrioles of ovum
(b) Distal centriole of sperm
(c) Karyomeres
(d) Proximal centriole of sperm
Show Answer & Explanation

Answer: (d) Proximal centriole of sperm

Explanation:
1. The ovum loses its centrioles.
2. The proximal centriole of sperm forms the first spindle, so the zygote can divide.

Teacher's Note:
1. The distal centriole forms the axial filament.
2. The mother contributes cytoplasm; the father contributes the centriole.

Question 5: A human female has the maximum number of primary oocytes in her ovaries
(a) At menopause
(b) At puberty
(c) At birth
(d) Early in her fertile years
Show Answer & Explanation

Answer: (c) At birth

Explanation:
1. Approximately 2 million primary oocytes are present at birth.
2. Their number falls to about 400,000 by puberty.

Teacher's Note:
1. No new oocytes form after birth.
2. Atresia reduces the count.

Question 6: Eggs liberated from the ovary in humans are in the
(a) Secondary oocyte stage
(b) Primary oocyte stage
(c) Oogonial stage
(d) Mature ovum stage
Show Answer & Explanation

Answer: (a) Secondary oocyte stage

Explanation:
1. At ovulation, a secondary oocyte arrested at metaphase II is released.
2. It completes meiosis II after sperm entry.

Teacher's Note:
1. The first polar body is formed before ovulation.
2. The second polar body forms after sperm entry.

Question 7: The first meiotic division during oogenesis occurs in
(a) First polar body
(b) Second polar body
(c) Primary oocytes
(d) Secondary polar body
Show Answer & Explanation

Answer: (c) Primary oocytes

Explanation:
1. Meiosis I takes place in the primary oocyte, giving a secondary oocyte and the first polar body.

Teacher's Note:
1. Primary oocyte is diploid.
2. Secondary oocyte is haploid.

Question 8: The process of spermatogenesis and oogenesis in most vertebrates is under the influence of which hormone?
(a) Oxytocin
(b) FSH
(c) ACTH
(d) ICSH
Show Answer & Explanation

Answer: (b) FSH

Explanation:
1. FSH from the anterior pituitary promotes gametogenesis (and follicle growth).

Teacher's Note:
1. ICSH (= LH) stimulates testosterone secretion.
2. Oxytocin is for contraction.

Question 9: During which stage of gametogenesis does meiosis occur?
(a) Growth phase
(b) Multiplication phase
(c) Maturation phase
(d) None of these
Show Answer & Explanation

Answer: (c) Maturation phase

Explanation:
1. Meiosis occurs in the maturation phase of gametogenesis.

Teacher's Note:
1. Multiplication phase involves mitosis.
2. Growth phase involves enlargement of cells.

Question 10: The primary egg membrane of the mammalian egg is termed
(a) Chorion
(b) Corona radiata
(c) Zona pellucida
(d) Jelly coat
Show Answer & Explanation

Answer: (c) Zona pellucida

Explanation:
1. The zona pellucida is a glycoprotein layer secreted by the oocyte and follicular cells.

Teacher's Note:
1. Corona radiata is the outermost layer of follicular cells.
2. Vitelline membrane is the primary membrane in many other animals.

Question 11: The stored food of oocytes is
(a) Nucleus
(b) Cytoplasm
(c) Cortical granules
(d) Yolk
Show Answer & Explanation

Answer: (d) Yolk

Explanation:
1. Yolk stores nutrients for the early embryo.

Teacher's Note:
1. Cortical granules are used to block polyspermy.
2. Mammalian eggs contain little yolk.

Question 12: Cleidoic eggs are found in
(a) Birds
(b) Reptiles
(c) Insects
(d) All of the above
Show Answer & Explanation

Answer: (d) All of the above

Explanation:
1. Cleidoic eggs have a shell and are laid on land.

Teacher's Note:
1. They are an adaptation for terrestrial life.
2. The shell is porous to allow gas exchange.

Question 13: The egg of a cockroach is
(a) Isolecithal
(b) Telolecithal
(c) Microlecithal
(d) Centrolecithal
Show Answer & Explanation

Answer: (d) Centrolecithal

Explanation:
1. Insect eggs have yolk concentrated in the centre.

Teacher's Note:
1. Centrolecithal eggs show superficial cleavage.
2. Telolecithal: yolk at one pole.

Question 14: Isolecithal eggs are found in
(a) Birds
(b) Frogs
(c) Insects
(d) Humans
Show Answer & Explanation

Answer: (d) Humans

Explanation:
1. Isolecithal eggs have a little yolk evenly distributed. Humans have such eggs.

Teacher's Note:
1. Also called homolecithal.
2. Birds have a lot of yolk.

Question 15: The eggs of birds are called
(a) Polylecithal
(b) Megalecithal
(c) Macrolecithal
(d) All of the above
Show Answer & Explanation

Answer: (d) All of the above

Explanation:
1. Bird eggs have a large yolk mass, so all three terms apply.

Teacher's Note:
1. Telolecithal with heavy yolk.
2. Show meroblastic cleavage.

Question 16: Which of the following is a correct match?
(a) Centrolecithal egg - insect
(b) Megalecithal egg - eutherian mammals
(c) Microlecithal egg - reptiles
(d) Alecithal egg - birds
Show Answer & Explanation

Answer: (a) Centrolecithal egg - insect

Explanation:
1. Insects have centrolecithal eggs.
2. Eutherian mammals have microlecithal, reptiles megalecithal and birds megalecithal eggs.

Teacher's Note:
1. Match yolk quantity with the habitat.
2. Eutherian mammals nourish embryos by the placenta.

Question 17: The process of yolk synthesis is called
(a) Lipogenesis
(b) Glycogenesis
(c) Vitellogenesis
(d) Oogenesis
Show Answer & Explanation

Answer: (c) Vitellogenesis

Explanation:
1. Yolk (vitellus) formation is vitellogenesis.

Teacher's Note:
1. It occurs during the growth phase of oogenesis.
2. Oogenesis is the formation of ova.

Question 18: Butterflies, moths, honey bees and beetles lay eggs of which type?
(a) Microlecithal
(b) Mesolecithal
(c) Telolecithal
(d) Centrolecithal
Show Answer & Explanation

Answer: (d) Centrolecithal

Explanation:
1. Insects have centrolecithal eggs with the yolk in the middle.

Teacher's Note:
1. Superficial cleavage follows.
2. Most arthropods have centrolecithal eggs.

Question 19: Microlecithal eggs are found in
(a) Reptilia and Aves
(b) Amphibia, Aves and Reptilia
(c) Reptilia, Aves and Chiroptera
(d) Eutheria
Show Answer & Explanation

Answer: (d) Eutheria

Explanation:
1. Eutherian mammals have microlecithal eggs.

Teacher's Note:
1. Amphibians have mesolecithal eggs.
2. Reptiles and birds have megalecithal eggs.

Question 20: In mammals, the egg is microlecithal and isolecithal because they are
(a) Oviparous
(b) Viviparous
(c) Ovoviviparous
(d) None of these
Show Answer & Explanation

Answer: (b) Viviparous

Explanation:
1. The embryo gets nutrition from the mother through the placenta.
2. So the egg needs little yolk.

Teacher's Note:
1. Viviparity reduces yolk requirement.
2. Monotremes are the exception, being oviparous.

Question 21: Graafian follicles are found in the
(a) Testis of mammals
(b) Ovary of frog
(c) Ovary of cockroach
(d) Ovary of mammals
Show Answer & Explanation

Answer: (d) Ovary of mammals

Explanation:
1. Graafian (mature) follicles occur in mammalian ovaries.

Teacher's Note:
1. Named after Regnier de Graaf.
2. It holds the secondary oocyte.

Question 22: A Graafian follicle contains
(a) Many oocytes
(b) Many sperm
(c) A single oocyte
(d) A site for egg fertilization
Show Answer & Explanation

Answer: (c) A single oocyte

Explanation:
1. Each follicle holds one oocyte.

Teacher's Note:
1. The antrum is filled with liquor folliculi.
2. After ovulation it forms the corpus luteum.

Question 23: The antrum is filled with fluid and is found in
(a) Bone marrow
(b) Cavity of the brain
(c) Graafian follicle of the ovary
(d) Pericardium of the heart
Show Answer & Explanation

Answer: (c) Graafian follicle of the ovary

Explanation:
1. The antrum is the fluid-filled cavity in the tertiary/Graafian follicle.

Teacher's Note:
1. The fluid is liquor folliculi.
2. It enlarges as the follicle matures.

Question 24: Which of the following is a fibrous layer of the follicle?
(a) Theca externa
(b) Zona pellucida
(c) Membrana granulosa
(d) Vitelline membrane
Show Answer & Explanation

Answer: (a) Theca externa

Explanation:
1. Theca externa is the outer fibrous layer around the follicle.

Teacher's Note:
1. Theca interna is vascular and secretes estrogen.
2. Granulosa cells line the follicle.

Question 25: In the case of non-fertilization, the corpus luteum
(a) Stops secreting progesterone
(b) Changes into the corpus albicans
(c) Starts producing progesterone
(d) None of these
Show Answer & Explanation

Answer: (b) Changes into the corpus albicans

Explanation:
1. Without hCG the corpus luteum degenerates and becomes a scar-like corpus albicans.

Teacher's Note:
1. Progesterone then falls and menstruation starts.
2. Pregnancy keeps the corpus luteum alive via hCG.

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