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Geitonogamy involves:

1. Fertilization of a flower by the pollen from another flower of the same plant.
2. Fertilization of a flower by the pollen from the same flower.
3. Fertilization of a flower by the pollen from a flower of another plant in the same population.
4. Fertilization of a flower by the pollen from a flower of another plant belonging to a distant population.

Correct answer: Fertilization of a flower by the pollen from another flower of the same plant.

Solution

Geitonogamy is pollination between two different flowers on the same plant, so the pollen comes from another flower of the same individual. It is distinct from autogamy (same flower) and xenogamy (different plants).

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