161.

Ovulation takes place in a month between

• 11-14 day

• 14-16 day

• 15-28 day

• 21-26 day

The embryo at 16 celled stage is known as

• morula

• gastrula

• blastula

• blastomere

Which of the following is not vestigial in man ?

• Tail vertebrae

• Nails

• Nictitating membrane

• Vermiform appendix

The leydig cells secrete :

• oestrogen

• testosterone

• progesterone

• corticosterone

How many sperms are formed by four primary spermatocyte :

• 1

• 4

• 16

• 32

The origin of kidney and ureter in Rana tigrina is :

• all mesodermal

• all endodermal

• ectodermal and mesodermal

• mesodermal and endodermal

Which of the following is not a case of epimorphosis ?

• Formation of sperms from small clumps of cells

• Regeneration of tail in a lizard

• Replacement of severed arm in starfish

• Replacement of limb in salamander

Which of the following steroid sex hormone influenced secondary sex organs?

• Progesterone

• Oestrogen

• LH

• LTH

An oocyte is released from the ovary under the influence of LH 

• after completing meiosis and before polar bodies are released

• after completing meiosis I and before release of polar bodies

• after completing meiosis

• after completing meiosis I and after release of polar bodies.

Which of the following statement is wrong?

• The Sertoli cells provide nutrition to the developing male germ cells

• Leydig cells synthesize and secrete androgens

• Secretions of the acrosome helps the sperm to enter into the cytoplasm of the ovum

• Secondary spermatocytes are diploid

• Secondary spermatocytes are diploid