The eggs in which the fate of every part of the egg becomes fixed are called:

Assertion : Mammalian ova produces hyaluronidase.
Reason : The eggs of mammal are microlecithal and telolecithal.

Assertion: Females have less stature than males after puberty.
Reason: This happens because of the presence of $hCG$ in the blood of females.

In mammals,eggs are microlecithal and isolecithal because these are

Differentiate between the following:
$1.$ External reproductive characteristics of male and female.
$2.$ Internal reproductive characteristics of male and female.

Which one of the following is the effect of higher $pH$ on the sperms?