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

In castor and maize plant __________

A male and female flowers are borne by different plants
B autogamy is prevented but not geitonogamy
C the anthers and stigma are placed at different positions to encourage cross pollination
D both autogamy and geitonogamy are prevented

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Answer & Solution

Correct Answer

(B) autogamy is prevented but not geitonogamy

Step-by-step Solution

Detailed explanation

(B) autogamy is prevented but not geitonogamy,
In maize and castor plant, unisexual flowers are present, though both male and female flowers can be present on same plant. This prevents autogamy but not geitonogamy.

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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