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Which statement correctly defines cross-pollination?
APollen moves to a stigma on the same flower
BPollen moves to a stigma on the same plant
CPollen moves to a stigma on a different plant
DPollen moves to an ovule on a different plant
Answer & Solution
Correct answer: C. Pollen moves to a stigma on a different plant
1. Self-pollination puts pollen from an anther onto the stigma of the same flower, or another flower on the same plant.
2. Cross-pollination takes pollen from the anther of one flower to the stigma of another flower on a different individual of the same species.
3. So the defining feature is that the two flowers belong to different plants.
4. Pollen never travels directly to an ovule, since it lands on a stigma and grows a tube from there.
5. Self-pollination costs the plant nothing in nectar or pollen rewards, whereas cross-pollination generally needs a pollinator.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 32 "Plant Reproduction", section 32.2 Pollination and Fertilization_
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