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 take while performing this activity.

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.