Question

Observe the picture of an activity given as Figure carried out with leaves of plants and polythene bag.

Now answer the following.

1. Which process is demonstrated in the activity?
2. When will this activity show better results on a bright sunny day or a cloudy day?
3. What will you observe in the polythene bag after a few hours of setting up the activity?
4. Mention any one precaution you must.

Answer 1

1. The process of transpiration is being demonstrate in the given activity. The loss of water in the vapour form from the exposed parts of a plant (mainly leaves) is called transpiration.
2. The activity will show better results on a bright sunny day because the rate of transpiration increases in the presence of strong sunlight.
3. After a few hours, small drops of water will be seen inside the polythene cover.
4. (i) The set-up must be airtight.
   (ii) Polythene bag must be dry.
   (iii) The twig must be fresh with 10-12 leaves.