Question

Q. Given below is an apparatus which was setup to
investigate a physiological process in plants. The setup
was placed in bright sunlight. Answer the questions
that follow :

(1) Name the process being studied. Define the
process.
(ii) Why was the pot enclosed in a rubber sheet ?
(iii) Mention two external factors which can
accelerate the above process.
(iv) List two adaptations in plants to reduce the
above process.
​

Answer 1

Answer:

Explanation:

1. Transpiration. The process in which plants lose water in the form of vapour from its aerial parts is called transpiration.

2. The pot was covered with a rubber sheet to prevent escape of the soil water as vapour.

3. Various factors that increase the rate of transpiration are high temperature, wind, light intensity, etc.

4. Adaptations to reduce transpiration-

a. Leaves reduced to spines reduces the surface area for transpiration.

b. Reduced number of stomata reduces the transpiration rate

c. Waxy leaf cuticle is impermeable to water, which stops evaporation.

d. Rolled leaves, leaf hairs, and stomata sunk in pits trap moist air, which increases the humidity and reduces the diffusion of water vapour.

Answer 2

Answer:

I.   Transpiration

II.    To prevent escape of moisture into atmosphere    

III.     * Intensity of sunlight

        * Temperature

IV.     * Leaves become narrow

   * Thick cuticle on the surface of the leaves