Relative sizes of an egg cell, morula, blastula and gastrula are

In which of the following animal cleavage divisions are restricted to a small part of cytoplasm & nucleus in animal pole of egg

There is a connective tissue cord extending between the testis and abdominal wall called

The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for

Identify the correct option ($A$), ($B$), ($C$), ($D$) with respect to spermatogenesis.

Egg of rabbit and man are