Arrange the following stages of oogenesis in order of their occurrenc…

The correct answer is Option (2) → (B), (C), (D), (A)

(B) Oogonia — first. Oogonia are the egg mother cells, formed in each ovary while the girl is still a foetus.

(C) Primary oocyte — second. The oogonia enter prophase I of meiosis and stop there; they are now primary oocytes.

(D) Secondary oocyte — third. Inside the tertiary follicle, the primary oocyte completes the first meiotic division, giving a large haploid secondary oocyte and a tiny first polar body.

(A) Ovum — last. The secondary oocyte completes the second meiotic division only when a sperm enters it, giving the ovum and a second polar body.

Note: A similar question was also asked in CUET (UG) 2025 on 14-05-2025 (Slot 1).

NCERT Extract:
Gametogenesis – “… 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 (oogonia) are formed within each fetal 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. … It is important to draw your attention that it is at this stage that the primary oocyte within the tertiary follicle grows in size and completes its first meiotic division. It is an unequal division resulting in the formation of a large haploid secondary oocyte and a tiny first polar body (Figure 2.8b).”
Fertilisation and Implantation – “… The second meiotic division is also unequal and results in the formation of a second polar body and a haploid ovum (ootid).”