STD 11 - 19. Chemical coordination and integration — NEET STD 11 Science — Question

Which statement is correct for oogenesis ?
(i) The process of oogenesis is markedly different from spermatogenesis.
(ii) Oogenesis is initiated during the embryonic development stage.
(iii) Millions of oogonia are formed within each foetal ovary.
(iv) No more oogonia are formed and added after birth.
(v) Oogonia start division and enter into prophase - II of the meiotic division and get temporarily arrested at that stage, called primary oocytes.
(vi) A large number of Graafian follicle degenerate during the phase from birth to puberty.
(vii) At puberty only 60,000-80,000 primary follicles are left in each ovary.

Punnet square is a representation to calculate

Mutation rates are affected by

Choose false sentence.

Assertion : A cerebellum is related with skillful voluntary movement and involuntary activity like body balance, equilibrium, etc.
Reason : It is part of hind brain and it is situated behind the pons.

Hormone released by posterior lobe of pituitary is concerned with

Artificial insemination means

Which one of the following is not observed in biodiversity hotspots ?

Assertion: Tubular secretion helps in the maintenance of ionic and acid base balance of body fluids.
Reason: During urine formation, the tubular cells secrete substances like H+, K+ and ammonia into the filtrate.