question_answer

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.

Cumulus oophorus is formed of

A) Interstial cells

B) Follicular cells

C) Granulosa cells

D) Germ cells