Which among the following helps in maintaining the low temperature of…

The correct answer is Option (3) → Scrotum.

Sperms are formed properly only at a temperature a little below the normal internal body temperature. So the testes lie outside the abdominal cavity, in a pouch of skin called the scrotum. The scrotum keeps the testes about 2-2.5°C cooler than the inside of the body, which spermatogenesis needs.

Option (1) Seminiferous tubules. — Incorrect. Seminiferous tubules are the coiled tubes inside each testicular lobule. Sperms are made in them, but they do not control the temperature of the testis.

Option (2) Ovaries. — Incorrect. Ovaries are the primary sex organs of females. They have nothing to do with the testes.

Option (3) Scrotum. — Correct. The scrotum holds the testes outside the body cavity and so maintains their low temperature.

Option (4) Interstitial cells. — Incorrect. Interstitial cells (Leydig cells) lie between the seminiferous tubules. They secrete androgens, the male hormones, and do not regulate temperature.

NCERT Extract:
The Male Reproductive System – “The male reproductive system is located in the pelvis region (Figure 2.1a). It includes a pair of testes alongwith accessory ducts, glands and the external genitalia. The testes are situated outside the abdominal cavity within a pouch called scrotum. The scrotum helps in maintaining the low temperature of the testes (2–2.5^o C lower than the normal internal body temperature) necessary for spermatogenesis.”