Q11
Capacitation refers to changes in the:
Correct Answer
Option D
Solution
(d) Capacitation occurs in sperm before fertilization in the female reproductive tract.
Human Reproduction
Q12
At the end of the first meiotic division, male germ cells differentiate into
Correct Answer
Option B
Solution
(b) First meiotic division: primary spermatocyte (2n) → two secondary spermatocytes (n).
Q13
Location and secretion of Leydig's cells are
Correct Answer
Option C
Solution
(c) Leydig's (interstitial) cells are present in testes and secrete testosterone.
Q14
In vitro fertilisation is a technique that involves transfer of which one of the following into the uterus?
Correct Answer
Option A
Solution
(a) In IVF, either zygote or early embryo up to 8 blastomeres is transferred into the uterus.
Q15
Extra-embryonic membranes of the mammalian embryo are derived from
Correct Answer
Option B
Solution
(b) The four extra-embryonic membranes (amnion, chorion, allantois, yolk sac) arise from the trophoblast.
Q16
Which extra-embryonic membrane in humans prevents desiccation of the embryo inside the uterus?
Correct Answer
Option D
Solution
(d) Amnion encloses the embryo in amniotic fluid, protecting it from desiccation.
Q17
The correct sequence of development of human embryo is
Correct Answer
Option A
Solution
(a) Fertilisation → zygote → cleavage → morula → blastula → gastrula.
Q18
A change in the amount of yolk and its distribution in the egg will affect
Correct Answer
Option A
Solution
(a) Amount and distribution of yolk determines the pattern of cleavage.
Q19
Extrusion of second polar body from egg nucleus occurs:
Correct Answer
Option A
Solution
(a) Second polar body is extruded after sperm entry but before syngamy (nuclear fusion).
Q20
Extrusion of second polar body from egg nucleus occurs
Correct Answer
Option A
Solution
(a) Entry of sperm stimulates secondary oocyte to resume and complete meiosis II, extruding second polar body.
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