Which of the following statements is not correct?

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Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil.

Some reptiles have also been reported as pollinators in some plant species.

Pollen grains of many species can germinate on the stigma of a flower, but onlyone pollen tube of the same species grows into the style.

Insects that consume pollen or nectar without bringing about pollination are called pollen/ nectar robbers.

answer is C.

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Detailed Solution

Pollen grains of many species cannot germinate on the stigma of a flower as the pollen grains from other species will not be accepted.Most pollen grains are monosiphonous, i.e., only a single pollen tube emerges from each pollen grain; others, like those of the Malvaceae, Cucurbitaceae and Campanulaceae, are polysiphonous. In Althaea rosea 10 tubes, and in Malva neglecta even 14 tubes, are known to come out from the same pollen grain. Eventually, however, only one of them makes further progress.

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