NEET · Biology · STD 12 - 1. sexual reproduction in flowering plants

Given below are two statements : Statement \(I:\)Cleistogamous flowers are invariably autogamous Statement \(II:\)Cleistogamy is disadvantageous as there is no chance for cross pollination. In the light of the above statements, choose the correct answer from the options given below :

A Both Statement \(I\) and Statement \(II\) are incorrect
B Statement \(I\) is correct but Statement \(II\) is incorrect
C Statement \(I\) is incorrect but Statement \(II\) is correct
D Both Statement \(I\) and Statement \(II\) are correct

Verified Solution

Answer & Solution

Correct Answer

(D) Both Statement \(I\) and Statement \(II\) are correct

Step-by-step Solution

Detailed explanation

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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Match List \(- I\) with List \(- II.\)

List \(- I\)	List \(- II\)
\((a)\) Adaptive radiation	\((i)\) Selection of resistant varieties due to excessive use of herbicides and pesticides
\((b)\) Convergent evolution	\((ii)\) Bones of forelimbs in Man and Whale
\((c)\) Divergent evolution	\((iii)\) Wings of Butterfly and Bird
\((d)\) Evolution by anthropogenic action	\((iv)\) Darwin Finches

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