Draw a pyramid of numbers where a large number of insects are feeding on the leaves of a tree. What is the shape of this pyramid?

Class 12th Biology Education, Question- Explain the functions of the following structures in the human male reproductive system.

Biology

These are the options for the Question :Explain the functions of the following structures in the human male reproductive system.

(a) Scrotum
(b) Leydig cells
(c) Male accessory glands

The correct answer is –

(a)Scrotum: The testes are situated outside the abdominal cavity within apouch called scrotum. The scrotum helps in maintaining the low
temperature of the testes (2–2.5 degree celsius lower than the normal
internal body temperature) necessary for spermatogenesis.

(b)Leydig cells: The regions outside the seminiferous tubules called
interstitial spaces, contain small blood vessels and interstitial cells or
Leydig cells. Leydig cells synthesize and secrete testicular hormones
called androgens.

(c) Male accessory glands: The male accessory glands include paired
seminal vesicles, a prostate and paired bulbourethral glands.
Secretions of these glands constitute the seminal plasma which is rich
in fructose, calcium and certain enzymes. The secretions of
bulbourethral glands also help in the lubrication of the penis.