Free Human Reproduction (Monthly Quiz: 1) NEET Biology Questions & Answers with Detailed Explanation & Full Review

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Free Human Reproduction (Monthly Quiz: 1) Time:

Question-1

Assertion:
Rupture of Graffian follicle occur before the 14th day of onset of next menstrual cycle.
Reason:
LH level is maximum during the mid of cycle, i.e., (14th day).

(a)

(b)

(c)

(d)

Question-2

Morula is a developmental stage

(a)

(b)

(c)

(d)

Question-3

Assertion (A) The testes are situated outside the abdominal cavity within scrotum.
Reason (R) Muscles in scrotum helps to maintain low temperature of testes, necessary for spermatogenesis.

(a)

(b)

(c)

(d)

Explanation:

Answer: (b)

Both Assertion and Reason are true and Reason is the correct explanation of Assertion. The testes are situated outside the abdominal cavity within a pouch called scrotum. The scrotum helps in maintaining the low temperature of the testes (2-2.5°C) lower than the normal internal body temperature necessary for spermatogenesis.

Question-4

Termination of gastrulation is indicated by

(a)

(b)

(c)

(d)

Explanation:

Answer: (c)

Gastrulation is the process through which the presumptive areas of organ specific rudiments present on the surface of blastula move to their specific positions where these occur in the adult. Gastrulation results in setting apart of the three primary germinal layers i.e., the ectoderm, mesoderm and endoderm from single layer of cells, the blastoderm, and in the formation of primordial gut or archenteron. At the onset of gastrulation, the blastoderm at the vegetal pole becomes flat. It gradually bends inwards till the embryo assumes the appearance of a double-walled cup. The cavity formed by invagination is called archenteron or primitive gut. Its opening is called blastopore and the embryo at this stage is gastrula.

As a result of invagination, the presumptive endoderm, mesoderm and notochord are shifted from the surface to the interior of the embryo. The blastocoel is gradually obliterated till the two layers come in contact. By the completion of gastrulation, the lateral horns of mesodermal crescent converge and come to lie on either side of the presumptive notochord.

Question-5

Extrusion of second polar body from egg nucleus occurs

(a)

(b)

(c)

(d)

Explanation:

Answer: (d)

Extrusion of second polar body from egg nucleus occurs after the entry of sperm but before fertilisation. The entry of sperm into female egg causes the breakdown of Metaphase Promoting Factor (MPF) and turns on Anaphase Promoting Factor (APF). Hence, the secondary oocyte completes its meiotic division after fertilisation and is said to be activated.

Question-6

Assertion:
Ovulation generally occur during the mid of cycle
Reason:
LH surge occur in mid of cycle.

(a)

(b)

(c)

(d)

Question-7

The part of the fallopian tube closer to the ovary is

(a)

(b)

(c)

(d)

Question-8

In 28 days human ovarian cycle, ovulation occurs on

(a)

(b)

(c)

(d)

Question-9

What does 'd' represent in the figure?

human-reproduction-neet-mcq-8-25-229-233

(a)

(b)

(c)

(d)

Question-10

Egg is liberated from ovary in

(a)

(b)

(c)

(d)

Question-11

Choose the incorrect statement (s).

(a)

(b)

(c)

(d)

Explanation:

Answer: (b)

The incorrect statement can be corrected as Oogonia are formed in the female at the foetal stage and no more oogonia are formed and added after birth. Rest of the statements are correct.

Question-12

The immature male germ cell undergo division to produce sperms by the process of spermatogenesis. Choose the correct one with reference to above.

(a)

(b)

(c)

(d)

Explanation:

Answer: (c)

In testis, the immature male germ cells (spermatogonia)produce sperms by the process of spermatogenesis. The spermatogonia present on the inside wall of seminiferous tubules multiply by mitotic division and increase in numbers. Each spermatogonia is diploid that contains 46(2n) chromosomes. Some of the spermatogonia called primary spermatocytes periodically undergo meiosis. A primary spermatocyte completes the first meiotic division(reduction division) leading to formation of two equal, haploid cells called secondary spermatocytes, which contains only 23 chromosomes each (n).The secondary spermatocytes undergo the second meiotic division to produce four equal, haploid spermatids. The spermatids are transformed into spermatozoa (sperms) by the process called spermiogenesis.

Question-13

Inner cell mass or embryoblast gives rise to

(a)

(b)

(c)

(d)

Question-14

The membranous cover of the ovum at ovulation is

(a)

(b)

(c)

(d)

Explanation:

Answer: (b)

The outermost membranous cover of the ovum at ovulation is corona radiata. It is formed by follicular cells. Inner to corona radiata is zona pellucida, which is made up of three different glycoproteins secreted by the ovum itself.

Question-15

Meroblastic cleavage is division

(a)

(b)

(c)

(d)

Question-16

The wall of uterus is made up of ____ layers of tissue.

(a)

(b)

(c)

(d)

Question-17

Match the following columns.
Column I (Female reproductive parts) Column II (Related to)
A. Ovaries1. Fertilisation
B. Oviduct2. Ovulation
C. Uterus3. Pregnancy
D. Cervix 4. Childbirth
Codes A B C D

(a)

(b)

(c)

(d)

Question-18

The ovulation phase is followed by ____ phase.

(a)

(b)

(c)

(d)

Question-19

Which of the following cells during gametogenesis is normally diploid ?

(a)

(b)

(c)

(d)

Explanation:

Answer: (c)

Spermatogonia are diploid cells which mature into primary spermatocytes (2n) by growth. They then produce two haploid secondary spermatocytes by meiosis I. Each secondary spermatocyte (n) completes the meiosis II and produces two spermatids (n). Each spermatid (n) develops into a spermatozoan or sperm (n).

Question-20

Bartholin's glands are situated

(a)

(b)

(c)

(d)

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