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Which of the following statements is not correct?

1. Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style.
2. Insects that consume pollen or nectar without bringing about pollination are called pollen/nectar robbers.
3. Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil.
4. Some reptiles have also been reported as pollinators in some plant species.

Correct answer: Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style.

Solution

The incorrect statement is A because pollen-pistil interactions are highly species-specific: compatible pollen of the same species is accepted, while incompatible pollen is usually rejected. The other statements are correct descriptions of pollination biology.

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