Which among the following helps in maintaining the low temperature of the testes ?

Scrotum.

The correct answer is Option (3) → Scrotum.

The male reproductive system is located in the pelvis region. 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 is a sac-like structure located outside the body, below the penis, containing the testes. Its position outside the body helps regulate the temperature of the testes. The testes need to be maintained at a slightly lower temperature than the rest of the body for the proper production and maturation of sperm. The scrotum helps in maintaining the low temperature of the testes (2–2.5 degree C lower than the normal internal body temperature) necessary for spermatogenesis.