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