Question

Why is there a need for green plants to convert the sugar into starch

Answer 1

It is transported in the plant as soluble sugars but stored as starch - which is insoluble, so it cannot escape from the cells. The stored starch can be turned backinto glucose later and used to release energy by respiration. Starch and glucose can also be used by the plant to make: cellulose for their cell walls.

Answer 2

By the help of sunlight during photosynthesis process in green plants sugar is converted into starch.