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What sort of environmental condition(s) selects for carnivorous plants?

What sort of environmental condition(s) selects for carnivorous plants?

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Most of the insectivorous plants are found in the water-logged soil which are deficient in nutirents like nitrogen and phosphorous. They compensate the lack of these nutients by digesting the insects. The ability to trap the pray for nutrients is the result of natural selection. According to researhers, the leaf of such plants have gained new enzymatic functions which help in breaking down the chitin of insects and utilizing their nutrients.Already existing genes in the plant acquired new biological function in course of evolution to cope up with the deficiency of nutrients.

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