The mature female gamete is formed by the process of -

The correct answer is Option (4) → Oogenesis

The process of forming a mature female gamete (ovum) is oogenesis. It starts in the foetal ovary and is very different from the formation of sperms.

(1) Spermatogenesis — Incorrect. This is the formation of sperms in the testis. It makes male gametes.

(2) Spermiogenesis — Incorrect. This is the change of a spermatid into a sperm. It is the last stage of spermatogenesis.

(3) Spermiation — Incorrect. This is the release of sperms from the Sertoli cells into the lumen of the seminiferous tubules. It also belongs to the male.

(4) Oogenesis — Correct. It forms the mature female gamete.

NCERT Extract:
Gametogenesis – …