What are pollen robbers / nectar robbers ?

Pollen robbers are

Who are called robbers?

What is be pollen?

What are the sources of nectar?

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 components 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

A floral visitor that consumes pollen or the nectar without bringing about pollination is

A floral visitor that consumes pollen or the nectar without bringing about pollination is