Humans are sexually reproducing and viviparous. The male reproductive system is composed of a pair of testes, the male sex accessory ducts and the accessory glands and external genitalia. Each testis has about 250 compartments called testicular lobules, and each lobule contains one to three highly coiled seminiferous tubules. Each seminiferous tubule is lined inside by spermatogonia and Sertoli cells. The spermatogonia undergo meiotic divisions leading to sperm formation, while Sertoli cells provide nutrition to the dividing germ cells. The Leydig cells outside the seminiferous tubules, synthesise and secrete testicular hormones called androgens. The male external genitalia is called penis.
Assertion (A): Sertoli cells undergo meiotic divisions to form sperms in the seminiferous tubules. Reason (R): Male germ cells provide nutritional support to developing gametes.
Correct answer: D — If both are false
NCERT states “The male germ cells undergo meiotic divisions finally leading to sperm formation, while Sertoli cells provide nutrition to the germ cells.” The Assertion is false - it’s the male germ cells that undergo meiosis, not Sertoli cells. Sertoli cells provide nutrition. The Reason is also false - it’s Sertoli cells that provide nutrition, not male germ cells. This creates a complete functional role reversal.
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