The meiotic division of the secondary oocyte is completed at the time of ................

Which of the following statements regarding the viability of human sperm is incorrect?

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

Given below are two statements:
Statement $I$:
The release of sperms into the seminiferous tubules is called spermiation.
Statement $II$:
Spermiogenesis is the process of formation of sperms from spermatogonia.
In the light of the above statements,choose the most appropriate answer from the options given below:

Graafian follicles are formed by the active division of

To reduce the weight of the spermatozoan and enhance its motility,the nucleus undergoes which of the following changes?