Question

Why do some plant feed on insects ? How does a pitcher plant catch insects ​

Answer 1

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The insectivorous plants grow in soil which do not contain sufficient nitrogen mineral. But they do not get the nitrogen from the soil in which they grow.

So, insectivorous or carnivorous plants feed on insects to obtain the nitrogen needed for their growth.

Answer 2

Explanation:

some plants feed on insects and other small flies for nitrogen ...

in most carnivorous plants the source of nitrogen in the soil they grow is low...

hence they feed on nitrogen sources/insects for food and nitrogen...

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

they catch the insects/flies as soon as they feel/sense that there is something on its flowers and fastly close their petals not allowing the insect/fly to escape

google answer: Foraging, flying or crawling insects such as flies are attracted to the cavity formed by the cupped leaf, often by visual lures such as anthocyanin pigments, and nectar bribes. ... Furthermore, some pitcher plants contain mutualistic insect larvae, which feed on trapped prey, and whose excreta the plant absorbs ...

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