Question

the pithcher plant and Venus flytrap are green plants that can photosynthesize. why do they need to feed on insects?​

Answer 1

Insectivorous plants grow in soil which do not contain sufficient nitrogen mineral. These plants (e.g. pitcher plant) are green and carry out photosynthesis to obtain a part of the food required by them. ... So, insectivorous or carnivorous plants feed on insects to obtain the nitrogen needed for their growth.

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Answer 2

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Pitcher are not carnivorous in the same way animals are, i.e. deriving energy from what they consume. These plants still rely on sunlight as their energy source and use carbon dioxide to make sugars.

These plants typically live in very wet climates in which soil nutrition is very poor and plants are not able to uptake the necessary fertilizers to survive. In order to overcome this problem, carnivorous plants catch insects and extract nitrogen among other nutrients in order to maintain normal growth.

In other words, the insects these plants consume are more like vitamin supplements than food.

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