Human Reproduction — Page 14 | NEET Biology

Q131

Which of the following layers in an antral follicle is acellular?

A Theca interna

B Stroma

C Zona pellucida

D Granulosa

Correct Answer

Option C

Solution

(c) Zona pellucida is formed as a new membrane by secondary oocyte around itself.

Q132

During cleavage, what is true about cells?

A Nucleocytoplasmic ratio remains unchanged

B Size does not increase

C There is less consumption of oxygen

D The division is like meiosis

Correct Answer

Option B

Solution

(b) During cleavage, cells divide rapidly without growth — blastomere size decreases.

Q133

Signals for parturition originate from:

A Both placenta as well as fully developed foetus

B Oxytocin released from maternal pituitary

C Placenta only

D Fully developed foetus only

Correct Answer

Option A

Solution

(a) Signals for parturition originate from the fully developed foetus and placenta.

Q134

What is the correct sequence of sperm formation?

A Spermatogonia, spermatocyte, spermatozoa, spermatid

B Spermatogonia; spermatozoa, spermatocyte, spermatid

C Spermatogonia, spermatocyte, spermatid, spermatozoa

D Spermatid, spermatocyte, spermatogonia, spermatozoa

Correct Answer

Option C

Solution

(c) In testis, the immature male germ cells or spermatogonia (2n) multiply by mitotic division and increase in number.

Some spermatogonia (2n) known as primary spermatocytes divide by meiotic division to form secondary spermatocytes (n).

The secondary spermatocytes undergo second meiotic division to produce spermatid which are transformed into spermatozoa (sperms) by the process called spermiogenesis.