NCERT says that each ovary has 60000 to 80000 primary follicles at puberty…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
NCERT says that each ovary has to primary follicles at puberty. (Other textbooks give higher numbers.) Over her whole life, a woman releases about ova from the two ovaries together. Take the follicles of one ovary.
- What per cent of follicles is ?
- What per cent of follicles is ?
Need a reminder? The key ideaShow
An ovary is to cm long. The follicles lie in its cortex. The oviduct has the infundibulum, the ampulla and the isthmus. Fertilisation is in the ampulla. The wall of the uterus has the perimetrium, the myometrium and the endometrium. The reproductive life of a woman runs from the first menstruation to menopause, about years of age.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Ova released: . Follicles: or .
Plan. Divide the ova by the follicles and change to a per cent.
Step 1. (a) .
Step 2. (b) .
Answer: ; .
Check. More follicles give a smaller per cent. In both cases less than of the follicles ever release an ovum. The rest degenerate.
Source. NCERT (2023), Biology, Class XII, chapter 2. Other texts give about to follicles at puberty, which makes the share even smaller.
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