What is photosynthesis?

A physico-chemical process by which green plants use light energy to drive the synthesis of organic compounds (food). It is the primary source of all food on earth and releases O₂.

Autotroph vs heterotroph

Autotrophs (green plants) synthesise their own food by photosynthesis. Heterotrophs depend on green plants for food.

Two reasons photosynthesis is important

(1) It is the primary source of all food on earth. (2) It releases oxygen into the atmosphere.

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