Which of the following statements is not correct?
1. | Insects that consume pollen or nectar without bringing about pollination are called pollen-nectar robbers. |
2. | Pollen germination and pollen tube growth are regulated by chemical compounds of pollen interacting with those of the pistil. |
3. | Some reptiles have also been reported as pollinators in some plant species. |
4. | 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. |