NEET Biology Human Reproduction MCQs Set 05

Practice 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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This NEET Biology MCQ set on Human Reproduction gives 25 solved multiple choice questions with the correct option and a step-by-step explanation for every answer. It covers the male and female reproductive systems, gametogenesis, the menstrual cycle, fertilisation, implantation, pregnancy and lactation.

Question 1: Scrotum remains connected with abdomen or pelvic cavity by
(a) Spermatic cord
(b) Inguinal canals
(c) Testis
(d) Lobules
Show Answer & Explanation

Answer: (b) Inguinal canals

Explanation:
1. The scrotum remains connected with abdomen or pelvic cavity by inguinal canals. The spermatic cord formed from the spermatic artery, vein and nerve bound together with connective tissue, passes into the testis through inguinal canal

Question 2: Which is present in male rabbit but not present in female rabbit?
(a) Urethra
(b) Vagina
(c) Uterus
(d) Vas deferens
Show Answer & Explanation

Answer: (d) Vas deferens

Explanation:
1. Vas deferens is not present in female rabbit because vas deferens is associated with male sex organs as these carry spermatozoa from cauda epididymis to the ejaculatory duct.

Question 3: How many sperms are formed by four primary spermatocytes?
(a) 1
(b) 4
(c) 16
(d) 32
Show Answer & Explanation

Answer: (b) 4

Explanation:
1. Spermatogenesis is the formation of sperm from a germ cell. Four spermatozoa are produced from a primary spermatocyte therefore, 16 spermatozoa will be formed from four primary spermatocytes.

Question 4: Graafian follicle contains
(a) Oogaonial cells
(b) Corpus luteum
(c) Theca externa and theca interna
(d) Corpus albicans
Show Answer & Explanation

Answer: (c) Theca externa and theca interna

Explanation:
1. Graafian follicle is the mature follicle present in the ovary. It consists of an outermost layer called theca externa and inner to it is theca interna.

Question 5: In the beginning of menstruation what will happen?
(a) Ovulation takes place
(b) Corpus luteum degenerates
(c) Levels of LH and FSH increases
(d) Progesterone and oestrogen land increase
Show Answer & Explanation

Answer: (b) Corpus luteum degenerates

Explanation:
1. In beginning, the corpus luteum degenerates because of decreasing LH and progesterone level. This leads to the degradation at endometrium wall

Question 6: Through invagination of which of the following, mesoderm is formed?
(a) Primitive streak
(b) Inner mass of cell
(c) Endoderm
(d) Ectoderm
Show Answer & Explanation

Answer: (a) Primitive streak

Explanation:
1. Inner cell mass forms embryonic disc, which is composed of two layers, ectoderm above and endoderm below. Once the embryonic disc elongates, to form primitive streak which forms mesoderm.

Question 7: Which one of the following statements about human sperm is correct?
(a) Acrosome has a conical pointed structure used for piercing and penetrating the egg, resulting in fertilization
(b) The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilization
(c) Acrosome serves as a sensory structure leading the sperm towards the ovum
(d) Acrosome serves no particular function
Show Answer & Explanation

Answer: (b) The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilization

Explanation:
1. In penetration, acrosome of sperm undergoes acrosomal reaction and releases certain sperm lysins, which dissolve the egg envelops locally and make the path for the penetration of sperm.

Question 8: The embryo at 16-celled stage is known as
(a) Morula
(b) Gastrula
(c) Blastula
(d) Blastomere
Show Answer & Explanation

Answer: (a) Morula

Explanation:
1. The embryo at 16-celled stage is called the morula. It is the mass of cells resulting from the cleavage of the ovum before the formation of a blastula.

Question 9: The permissible use of the technique amniocentesis is for
(a) Detecting sex of the unborn foetus
(b) Artificial insemination
(c) Transfer of embryo into the uterus of a surrogate mother
(d) Detecting any genetic abnormality
Show Answer & Explanation

Answer: (d) Detecting any genetic abnormality

Explanation:
1. Amniocentesis is a technique for the diagnosis of congenital abnormalities before birth. By karyotypic studied of somatic cells, abnormalities due to changes in chromosome number like Down’s syndrome. Turner’s syndrome, Klinefelter’s syndrome, etc, can be determined.

Question 10: The blastomeres in the blastocyst are arranged into an outer layer called ……….. and an inner group of cells attached to trophoblast called the …….. mass.
The trophoblast layer gets attached to the …… and the ……. differentiated as the embryo. As a result the …….. becomes embeded in the endometrium of the uterus. This is called ….. and it leads to pregnancy. Blanks given in the above paragraph are filled in chronological order as
(a) Inner cell, trophoblast, endometrium, inner mass cell, blastocyst, implantation
(b) Trophoblast, inner cell, endometrium, inner mass cell, blastocyst, implantation
(c) Trophoblast, inner cell, endometrium, inner mass cell, implantation, blastocyst
(d) Trophoblast, inner cell, inner cell mass, endometrium, implantation, blastocyst
Show Answer & Explanation

Answer: (b) Trophoblast, inner cell, endometrium, inner mass cell, blastocyst, implantation

Explanation:
1. Trophoblast, inner cell, endometrium, inner mass cell, blastocyst, implantation

Question 11: Neubenkern is a part to
(a) Human ovum
(b) Foetus
(c) Human sperm
(d) Graafian follicle
Show Answer & Explanation

Answer: (c) Human sperm

Explanation:
1. Neubenkern is a part of middle piece of human sperm.

Question 12: Mammalian egg has
(a) No yolk at all
(b) Small amount of yolk
(c) Large amount of yolk
(d) Yolk concentrated at one pole
Show Answer & Explanation

Answer: (b) Small amount of yolk

Explanation:
1. Mammalian egg has very small amount of yolk.

Question 13: Fertilization of ovum by the sperm takes place in
(a) Ampulla of oviduct
(b) Isthmus of oviduct
(c) Fimbriae of oviduct
(d) None of the above
Show Answer & Explanation

Answer: (a) Ampulla of oviduct

Explanation:
1. Oviduct has four regions, infundibulum, ampulla, isthmus, and uterine part. Ampulla is the long, wide, thin walled major part of the fallopian tube or oviduct. It lies next to the infundibulum and is a site for fertilization.

Question 14: Milk secretion is maintained by …A…. This hormone inhibits the release from the pituitary and counters the …B… and …C…. Hence in nourishing mother, the menstrual cycle is suppressed. Here A,B and C are
(a) A-FSH, B-LH, C-prolactin
(b) A-prolactin, B-FSH, C-LH
(c) A-LH, B-FSH, C-prolactin
(d) A-LH, B-prolactin, C-FSH
Show Answer & Explanation

Answer: (b) A-prolactin, B-FSH, C-LH

Explanation:
1. Prolactin, FSH, LH

Question 15: Which part of the sperm contains hydrolytic enzymes?
(a) Head region
(b) Neck region
(c) Cap region
(d) Tail region
Show Answer & Explanation

Answer: (a) Head region

Explanation:
1. Acrosome contains hyaluronidase proteolytic enzymes, which is popularly known as sperm lysin as it is used to penetrate egg (ovum) at the time of fertilisaton

Question 16: Find out the correct statement.
(a) Amnion is the outer layer containing amniotic fluid that acts as shock absorber to the soft embryo
(b) Yolk sac is foetal membrane that helps in the nourishment of the embryo in general
(c) In mammals, allantois is not excretory in function
(d) Chorio-allantoic membrane davelops villi and contribute much to the development of placenta
Show Answer & Explanation

Answer: (a) Amnion is the outer layer containing amniotic fluid that acts as shock absorber to the soft embryo

Explanation:
1. Amnion is formed of mesoderm on outside and ectoderm inside. It has no blood vessels. Space between amnion and foetus is amniotic cavity and it contains amniotic fluid Amnion protects foetus from mechanical shock.

Question 17: The extra-embryonic membranes of mammalian embryo are derived from
(a) Trophoblast
(b) Follicle cells
(c) Formative cells
(d) Inner cell mass
Show Answer & Explanation

Answer: (a) Trophoblast

Explanation:
1. Trophoblast ia an epithelium surrounding the mammalian blastocyst forming outer layer of chorion and becoming part of the embryonic component of extra-embryonic membranes.

Question 18: Regeneration of liver is
(a) Metamorphosis
(b) Reparative regeneration
(c) Epimorphosis
(d) Morphogenesis
Show Answer & Explanation

Answer: (b) Reparative regeneration

Explanation:
1. When the regeneration is limited to the repair or healing of wounds, it is called reparative regeneration. It takes place by localized cell proliferation and migration, e.g., healing of bone fracture, regeneration of liver (compensatory regeneration).

Question 19: Sperm’s acrosome has
(a) Hyaluronic acid and proacrosin
(b) Hyaluronic acid and Fertilizin
(c) Hyaluronidase and proacrosin
(d) Fertilizin and proacrosin
Show Answer & Explanation

Answer: (c) Hyaluronidase and proacrosin

Explanation:
1. The acrosome of sperm contains lytic enzymes such as cathepsin, acid phosphatase, hyaluronidase, proacrosin. Hyaluronidase enzyme is found particularly in the sperms of mammals. This enzyme dissolves corona radiata enables the sperm to penetrate through it. Proacrosin changes into acrosin and helps to dissolve the zona pellucida layer of the ovum.

Question 20: After implantation, finger-like projections on the trophoblast are called …A…. which are surrounded by …B… and maternal blood.
Here A and B refers to
(a) A-chorion; B-foetal cell
(b) A-chorionic villi; B-uterine tissue
(c) A-uterine tissue; B-chorionic villi
(d) A-foetal cell; B-chorion
Show Answer & Explanation

Answer: (b) A-chorionic villi; B-uterine tissue

Explanation:
1. A-Chorionic villi; B-Uterine tissue

Question 21: Most mammals have their testis sac called scrotal sac which is for
(a) Protection
(b) Ova formation
(c) Sperm formation
(d) Temperature regulation
Show Answer & Explanation

Answer: (d) Temperature regulation

Explanation:
1. Without the scrotal sac there is no maintenance of temperature and without the maintenance of temperature, there will be no sperm production

Question 22: In the human female, menstruation can be deferred by the administration of
(a) LH only
(b) Combination of FSH and LH
(c) Combination of oestrogen and progesterone
(d) FSH only
Show Answer & Explanation

Answer: (c) Combination of oestrogen and progesterone

Explanation:
1. By supply of oestrogen and progesterone, the menstruation can be deferred.

Question 23: In frog , chromosome number is reduced to half
(a) When 2nd polar body is separated
(b) When 2nd polar body is divided
(c) When 3rd polar body is separated
(d) When 1st polar body is separated
Show Answer & Explanation

Answer: (d) When 1st polar body is separated

Explanation:
1. In frog , when 1st polar body is separated, the chromosome number becomes half.

Question 24: Blastopore is found in
(a) Blastula and is opening of archenteron
(b) Blastula and is opening of blastocoels
(c) Gastrula and is opening of archenteron
(d) Gastrula and is opening of blastocoels
Show Answer & Explanation

Answer: (c) Gastrula and is opening of archenteron

Explanation:
1. Blastopore is found in gastrula. Gastrula is characterized by ectoderm, endoderm, archenteron and blastopore, dorsal lip of blastopore has organiser properties. If dorsal lip is removed, organ formation does not take place.

Question 25: The correct sequence of male reproductive structures of rabbit through which sperms pass out is
Rete testes
Vasa efferentia
Epididymis
Vasa deferentia
(a) I, II, III, IV
(b) II, III, IV, I
(c) II, III, I, IV
(d) I, III, II, IV
Show Answer & Explanation

Answer: (a) I, II, III, IV

Explanation:
1. In rabbit, sperms are produced in seminiferous tubles, which open into a network called rete testes. It opens by several fine ductless glands called vasa efferentia, into epididymis. The basal end of each epididymis leads into a muscular tube called vas deferens.

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