1. Tardigrade
  2. Question
  3. Biology
  4. Given below are the steps involved in oogenesis. Arrange them in proper sequence and select the correct option. 1. Formation of primary follicle due to development of granulosa cells. 2. Division of oogonia and formation of the primary oocyte. 3. Formation of follicles having antrum. 4. Formation of secondary follicles. 5. An unequal division leading to the formation of secondary oocyte i.e. ovum and the first polar body.

Q. Given below are the steps involved in oogenesis. Arrange them in proper sequence and select the correct option.

Formation of primary follicle due to development of granulosa cells.

Division of oogonia and formation of the primary oocyte.

Formation of follicles having antrum.

Formation of secondary follicles.

An unequal division leading to the formation of secondary oocyte i.e. ovum and the first polar body.

 1796  190 NTA AbhyasNTA Abhyas 2020Human Reproduction Report Error

Solution:

The sequence of oogenesis (formation of ovum) is as follows:
Millions of oogonia are added in a female fetal ovary after birth. These oogonia undergo division and lead to the formation of primary oocytes. A layer of granulosa cells surrounds these oocytes, which leads to the formation of primary follicles. More and more layer of granulosa cells and a new theca surround these primary follicles which leads to the formation of secondary follicles A fluid filled cavity called antrum develops which leads to the formation of tertiary follicle. An unequal division of the tertiary follicle leads to the formation of a haploid secondary oocyte i.e. ovum and a tiny first polar body.