Which of the following statements is not correct?

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