Question

what features do small and not very colorful flowers have to attract insects

Answer 1

The insect pollinated flowers usually contain nectar which serves as food material to the insects and encourage them to keep returning to the plant.

Many plants develop brightly colored or white flowers to attract insects but some insects like flies, moths and beetles are drawn to pale, dull white or green flowers.

Flowers come in a variety of shapes to allow a particular insect to reach the nectar and pollen.

Also, these flowers have have sweet, spicy or rotten smells according to the insect they want to attract.