Human Reproduction MCQs for NEET — Zoology Questions with Answers

In females, the mammary glands are well developed, which is a characteristic feature distinguishing females from males.

The testes are situated in the scrotal sac, an external pouch of skin and muscle that helps to regulate the temperature of the testes, ensuring they remain slightly cooler than the body's core temperature. This is crucial for the proper production of sperm.

Testosterone is the primary hormone released by the testes. It plays a crucial role in the development of male reproductive tissues, the promotion of secondary sexual characteristics, and the production of sperm.

The male reproductive system includes several glands, such as the seminal vesicle, the prostate gland, and the bulbourethral gland. Each of these glands contributes to the production and secretion of seminal fluid, which helps to nourish and transport sperm.

Leydig's cells, also known as interstitial cells, are found in the interstitial space between the seminiferous tubules in the testis. These cells are responsible for the production of testosterone, which is essential for the development of male secondary sexual characteristics and spermatogenesis.

The epididymis serves several important functions. It acts as a temporary storage site for sperm, allows the immature sperm to complete their maturation process, and enables them to gain motility. Therefore, the correct answer is 'All of these'.

Approximately 60% of the volume of semen is produced by the seminal vesicles. The seminal fluid contains fructose, which provides energy for the sperm, and other substances that enhance sperm motility and viability.

The bulbourethral glands, also known as Cowper's glands, secrete a clear, viscous fluid that serves as a lubricant during sexual intercourse. This fluid helps to lubricate the urethra for spermatozoa to pass through and neutralizes traces of acidic urine in the urethra.