Give reasons for:

1. People climbing to high altitudes may suffer from dizziness and unsteady vision.
2. Lime water is used in most experiments on respiration.
3. Respiration rate is higher in animals than in plants.

1. At higher altitudes, the density of air is less and amount of oxygen is also less. This causes deficiency of oxygen in the body which further results in dizziness and unsteady vision.
2. Lime water is used in most experiments on respiration as lime water turns milky when it comes in contact with carbon dioxide. It is thus an easy way to detect carbon dioxide.
3. Animals lead an active life where physical movement is involved and have complex organ systems that require constant energy supply. Hence, respiration rate is higher in animals than in plants to meet the higher energy requirements.