Question

why does pitcher plant feed on insects though it is green

Answer 1

It lacks some nutrients which it fulfills by eating insects.

Therefore insects hepls in the enrichment of insectivorous plants like pitcher plant and venus flytrap.

Answer 2

A pitcher plant feeds on insects to obtain essential amino acids and nitrogen.

EXPLANATION:

Pitcher plants like all plants, have green leaves with chlorophyll. Their main source of nutrition is the glucose produced through photosynthesis. All organisms need a source of nitrogen to produce amino acids.

However, these plants don’t have a mechanism to absorb atmospheric as most plants do. They rely on their insectivorous diet to acquire the same. Thus, the pitcher plant feeds on insects.