(i) Transpiration
(ii) On a bright sunny day.
(iii) Small drops of water inside the polythene cover.
(iv) The set-up must be airtight/polythene bag must be dry/the twig must be fresh with 10-12 leaves. (Any one)
(i) Label the parts (a), (b), (c) and (d) in the diagram.(ii) What type of venation does the leaf has?(iii) What type of venation is seen in grass leaves?
Question
Observe the picture of an activity given below carried out with leaves of plants and polythene bag. 
Now answer the following: (i) Which process is demonstrated in the activity? (ii) When will this activity show better results—on a bright sunny day or a cloudy day?(iii) What will you observe in the polythene bag after a few hours of setting up the activity? (iv) Mention any one precaution you must take while performing this activity.
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