Question

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

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

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

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