Choose the correct option with respect to the assertion and reason given.
Assertion [A]: sperm are stripped of other organelles except for mitochondria.
Reason [R]: Sperm motility is important for fertility in humans.
[A] is false and [R] is true.
During spermiogenesis, i.e., the formation of spermatozoa from spermatids, all cell organelles except for the nucleus, acrosome, mitochondria and centrioles are removed so that sperm carry only the necessary cellular machinery required for travelling through the female reproductive tract and accomplishing fertilisation. Abnormal sperm structure as well as lack of motility are major causes of infertility in men. For fertility, a spermatic analysis should reveal 40% of the sperm being vigorously motile.