Identify the correct statements regarding human sperm.
(A) Around 90 percent of released sperms must have normal shape and size.
(B) The normal human male ejaculates about 200 to 300 million sperms during a coitus.
(C) At least 40 percent of released sperms must show vigorous motility for normal fertility.
(D) Acrosome is filled with numerous mitochondria that give energy for movement.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (B) and (C) only
For normal fertility, a man must release enough sperms, and enough of them must be normal and able to swim well.
(A) Around 90 percent of released sperms must have normal shape and size. — Incorrect. The figure is wrong. For normal fertility at least 60 per cent of the sperms must have normal shape and size.
(B) The normal human male ejaculates about 200 to 300 million sperms during a coitus. — Correct. This is the number of sperms released in one ejaculation.
(C) At least 40 percent of released sperms must show vigorous motility for normal fertility. — Correct. At least 40 per cent must swim actively (vigorous motility) to reach the ovum.
(D) Acrosome is filled with numerous mitochondria that give energy for movement. — Incorrect. The parts are mixed up. The acrosome, the cap on the head, is filled with enzymes that help the sperm to enter the ovum. The numerous mitochondria lie in the middle piece and give energy for the movement of the tail.
NCERT Extract:
Gametogenesis – …
