ICSE Class 10 Answered

(i) Transpiration.

(ii) Transpiration: It is the process in which water in the form of water vapour is lost from the aerial parts of the plant such as the leaves and soft stems of the plant. Only a small quantity of water absorbed by the roots is actually used by the plant body. The rest of the water is lost through transpiration. Transpiration helps to cool the plant body. It also helps to regulate the temperature of the surrounding area.

(iii) The plastic sheet will prevent the escape of water vapour from the pot which will help to carry out the experiment without any errors.

(iv) Transpiration creates a suction force and thus helps in the ascent of sap in the plant. Increased transpiration results in more water and minerals being absorbed from the soil by the root hair cells.

(v) A suitable control for this experiment would be a pot without a plant covered with a plastic sheet and kept in the bell jar.