Observe the two reactions given below.

Reaction 1 C₆H₁₂O₆ + 6O₂6CO₂ + 6H₂O + Energy

Reaction 2 6CO₂ + 6H₂O C₆H₁₂O₆ + 6O₂

a) Identify the process occurring in plants and in animals.

b) Which is the process that takes place only in plants?

a) Reaction 1 represents the process of aerobic respiration (a type of cellular respiration which takes place in presence of oxygen). In the respiration, sugar (glucose) is oxidised to carbon dioxide, water and releases energy in the form of ATP (adenosine tri- phosphate). it takes place in the mitochondria of the cell.

b) Reaction 2 represents the process of photosynthesis in green plants. In this process green plants makes food (glucose) in presence sunlight, carbon dioxide and water. Oxygen is formed as by-product in the process.