Explain why respiration is said to be the reverse of photosynthesis.

Respiration is said to be the reverse of photosynthesis due to the following reasons :

1. In respiration, organic food is broken down into inorganic substances, namely carbon dioxide and water. In photosynthesis, organic food is manufactured from inorganic substances, namely carbon dioxide and water.
2. In respiration, carbon dioxide is released whereas in photosynthesis, carbon dioxide is consumed.
3. Oxygen is consumed during respiration whereas oxygen is evolved during photosynthesis.
4. Energy is liberated during respiration whereas energy is absorbed during photosynthesis.