(B) fertilization of a flower by the pollen from the same flower

(C) fertilization of a flower by the pollen from a flower of another plant in the same population

(D) fertilization of a flower by the pollen from a flower of another plant belonging to a distant population.

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

Geitonogamy involves

A fertilization of a flower by the pollen from another flower of the same plant
B fertilization of a flower by the pollen from the same flower
C fertilization of a flower by the pollen from a flower of another plant in the same population
D fertilization of a flower by the pollen from a flower of another plant belonging to a distant population.

Verified Solution

Answer & Solution

Correct Answer

(A) fertilization of a flower by the pollen from another flower of the same plant

Step-by-step Solution

Detailed explanation

(a) : Geitonogamy is the pollination taking place between the two flowers of the same plant or genetically similar plant. Hence, genetically it is self pollination but since the agency is involved, it is ecologically, cross pollination.

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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