KCET · BIOLOGY · STD 12 - 1. Sexual Reproduction in Flowering Plants

The germ pores in the pollen grain are the regions

A which are made up of lignin and suberin
B that can withstand high temperature and strong acids and alkalies
C which lack sporopollenin
D through which sperms are released into the female gametphyte

Verified Solution

Answer & Solution

Correct Answer

(C) which lack sporopollenin

Step-by-step Solution

Detailed explanation

(C) which lack sporopollenin,
The outer layer of a mature pollen grain is made up of exine (which is composed of sporopollenin) and inner to it is intine (made up of cellulose and peetin). At certain places, exine remains thin and lacks sporopollenin. These areas are called germ pores. During pollen germination, pollen tube liberate out through these pores.

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.

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