Question

If the pitcher plant is green and carries out photosynthesis, then why does it feed on insects?

Answer 1

Whatever the mechanism of digestion, the prey items are converted into a solution of amino acids, peptides, phosphates, ammonium and urea, from which the plant obtains its mineral nutrition (particularly nitrogen and phosphorus). Like all carnivorous plants, they occur in locations where the soil is too poor in minerals and/or too acidic for most plants to be able to grow...

Answer 2

It feeds on insects because the soil dors not provide it with the proper nutrients needed to grow. Other carnivores plants do the same because of this reason only.