MHT CET · BIOLOGY · STD 12 - 2. Reproduction in Lower and Higher Animals

Total number of primordial follicles which remain in ovary of human females, at the time of puberty, are _________ .

A 2 million
B 1 million
C 40000
D 416

Verified Solution

Answer & Solution

Correct Answer

(C) 40000

Step-by-step Solution

Detailed explanation

At birth, approximately 200,000 to 2,000,000 primary oocytes remain in each ovary. Of these, about 40,000 are still present at puberty.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Match parts of chromosome given in Column I with their explanation in Column II:

Column I (Chromosome)	Column II Column II (Explanation)
Q.1. Centromere	a. Disc shaped plate where spindle fibres get attached during cell division.
Q.2. Secondary constriction	b. Long unbranched slender highly coiled DNA.
Q.3. Kinetochore	c. Place where 2-chromatids are joined together.
Q.4. Chromatonema	d. Nucleolus gets organised at this place.

Choose the correct answer from the following options.

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	Column I		Column II
a.	Transferase	i.	aldolase
b.	Hydrolase	ii.	alcohol dehydrogenase
c.	Lyase	iii.	sucrase
d.	Oxidoreductase	iv.	glucokinase