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