Nutrition is defined as the process by which living organisms obtain and utilize food material from external environment for metabolic activities such as respiration, growth, excretion and reproduction.

Photosynthetic or holophytic Nutrition is defined as a process whereby green plant manufacture their own organic food from simple inorganic substances such as carbon (iv) oxide, water, sunlight and chlorophyll producing oxygen as by- product. The process can be summarized by equation as shown below

Importance of Photosynthesis

1. Production of food for living things
2. The process purifies atmosphere by making use of carbon (iv) oxide in the air

iii.        It maintain oxygen balance of the atmosphere by release more

1. It serves as a building block for other substances to be formed e.g. protein and oil