Some species of plants are insectivorous. Why?
1
Their growth in shady and dark places does not allow them to undertake sufficient photosynthesis and thus they depend on insects for nutrition
2
They are adapted to grow in nitrogen deficient soil and thus depend on insects for sufficient nitrogenous nutrition
3
They cannot synthesize certain vitamins themselves and depend on the insects digested by them
4
They have remained in that particular stage of evolution as living fossils, a link between autotrophs and heterotrophs