Assertion (A): At puberty only 60,000-80,000 primary follicles are left in each ovary. Reason (R): A large number of primary follicles degenerate during the phase from birth to puberty. Regarding (A) and (R):
Answers
assertion is wrong bcz it is at the time of birth not at the of puberty
Answer:
The answer for this qns is
A Assertion and Reason are true statements and R is the correct explanation of Assertion
Explanation:
This is clearly mentioned in biology class 12 ncert textbook pg.no 48 under the oogenesis part. It is true that the primary follicles degenerates from the birth phase to puberty and at puberty only 60000 to 80000 primary follicles that is left. This is the reason why women experience menopause by the age of 50. It is a natural process in which ovulation stops and as result menstruation on a monthly basis stops and the women will no longer be able to reproduce. As it is known, in a month either of the ovary releases only a single egg. If it is fertilized it results in pregnancy and if not the egg ruptures and it is released in the form of blood along with the endometrial line prepared by the uterus to receive the zygote in case fertilization occurs. It is this primary follicle that further develops into secondary oocyte and terminates into the ovum which is released every 28 days as menstruation or develops into a foetus in 9 months. If this generation started from the birth phase itself, then assume you are 20 years and planning to have a child. If each egg was released right from birth then by that time very few eggs only would be left anf the menopause age would be somewhere less than 30 . It is hence not practical and possible. since the degeneration of the primary follicle starts at puberty, menstruation occurs in puberty and menopause age is 50.
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