Question

Give reasons for:
(i) People climbing to high altitudes may suffer from dizziness and unsteady vision.
(ii) Use of lime water in most experiments on respiration.
(iii) Respiration rate is higher in animals than in plants.

Answer 1

(i) As we go up higher, the air we breathe decreases in pressure along with a gradual decrease in oxygen content. Lack of oxygen leads to dizziness and unsteady vision.
(ii) Lime water is used in most of the experiments on respiration as lime water turns milky in the presence of carbon dioxide.

(iii) Rate of respiration is higher in animals than in plants as the life processes in animals are more complex as compared to those in plants, moreover animals move from one place to another. This requires energy, resulting in greater rate of respiration.