Question 3
Most adaptations of animal-pollinated flowers amount to paying the visitor. Which one does not?
The right answer is the one marked above.
Bearing shapes that deceive insects. The insect is paid nothing, visits anyway, and the flower is pollinated all the same.
Scent and colour are advertisements and nectar is the reward — all three are the flower spending something to get a visit. Stickiness of the pollen and stigma is a fourth kind of adaptation again: it is about making the visit count once it happens.