Question

Which of the following statements is not correct?

• A. 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.
• B. Insects that consume pollen or nectar without bringing about pollination are called pollen nectar ⁄ robbers.
• C. Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil.
• D. Some reptiles have also been reported as pollinators in some plant species.

Answer 1

The correct option is A 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.

Air is full of pollen grains from different plant species. The arrival of a viable pollen grain on a receptive stigma does not guarantee fertilization.
When pollen grains of a different species land on a stigma they cannot germinate, this failure of pollen from one species to germinate and/or grow on the stigma of another species is known as interspecific incompatibility.