Question

Why do pitcher plants eat insects though they are green and make their food by photosynthesis?

Answer 1

Pitcher plants get carbohydrates by photosynthesis but they require proteins for growth and they grow in nitrogen deficit soils. So they acquire the nitrogen by consuming insects.

Answer 2

 Pitcher plant eats insects for its nitrogen requirement.

On the product of photosynthesis is carbohydrates and are also converted into protien and fats.Besides carbon,hydrogen and oxygen,protiens also contain NITROGEN.Nitrogen is present in the air but plants cannot use this nitrogen directly. 

In normal plants there is a bateria known as RIZOBIUM present in the root.But,in pitcher plant there is no such bacteria  present in the root and they depend upon insects for their nitrogen requirement.

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