Question

Distinguish between photosynthesis and respiration.

Answer 1

Photosynthesis	Respiration
It takes place only in the presence of sunlight.	It continues throughout day and night, in sun and darkness.
It occurs only in the green cells of the plant.	It occurs in all the cells of an organism.
It is an endothermic reaction as it absorbs sunlight.	It is an exothermic reaction, as it gives out energy.
It utilises carbon dioxide and water.	It evolves carbon dioxide and water.
It builds up complex compounds such as carbohydrates from simple inorganic compounds. So, it is an anabolic process.	It breaks complex substances into simple substances. So, it is a catbolic process.
It converts light energy into chemical energy.	It releases potential or chemical energy which is used variously in the body.
Carbon dioxide and water are raw materials for photosynthesis.	Sugars and oxygen are raw materials for respiration.
It produces ATP by harvesting light energy.	It forms ATP from energy liberated during oxidation of food.
Hydrogen of water is used in the synthesis of NADPH.	Hydrogen of food is used in the formation of NADP, NADPH and $FAD{H}_2$.
ATP and NADPH are used in the synthesis of organic compounds.	ATP and reduced coenzymes are made available to cells for various metabolic activities.