You have heard about several insectivorous plants that feed on insects. Nepenthes or the pitcher plant is one such example,which usually grows in shallow water or in marshy lands. What part of the plant is modified into a pitcher? How does this modification help the plant for food even though it can photosynthesize like any other green plant?

In insectivorous plants like the pitcher plant $(Nepenthes)$,the leaf is modified into a pitcher-like structure. The leaf apex forms a lid,which can open and close the mouth of the pitcher.
These plants are green and can perform photosynthesis to synthesize carbohydrates. However,they grow in nitrogen-deficient,marshy soils. To overcome this nitrogen deficiency,they trap and digest insects using digestive enzymes secreted within the pitcher. The digestion of insects provides the necessary nitrogenous compounds required for their growth and development.