Directions : (21 - 25) |
Read the passage given below and answer the following questions. |
The process of formation of a mature female gamete is called oogenesis which is markedly different from spermatogenesis. Oogenesis is initiated during the embryonic development stage when a couple of million gamete mother cells or oogonia are formed within each foetal ovary; no more oogonia are formed and added after birth. These cells start division and enter into prophase-I of the meiotic division and get temporarily arrested at that stage, called primary oocytes. Each primary oocyte then gets surrounded by a layer of granulosa cells and then called the primary follicle. A large number of these follicles degenerate, i.e. follicular atresia, and such follicles are called atretic follicles during the phase from birth to puberty. Therefore, at puberty only 60,000- 80,000 primary follicles are left in each ovary. The primary follicles get surrounded by more layers of granulosa cells and a new theca and called secondary follicles. The secondary follicle soon transforms into a tertiary follicle which is characterised by a fluid filled cavity called antrum or liquor folliculi. The theca layer is organised into an inner theca interna and an outer theca externa. A solid mass of follicular cells that surrounds the developing ovarian follicle is called cumulus oophorus or ovaricus formed by granulosa cells. |
A) Interstial cells
B) Follicular cells
C) Granulosa cells
D) Germ cells
Correct Answer: C
Solution :
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