UPSC NDA I 2021 General Ability Solved Paper

The correct answer is Experimental leaf 2 .
Key Points
- Loss of water to the air through evaporation from the leaves is called transpiration.
- Leaves have numerous pores known as stomata on the bottom of their surface.
- Stomata help the plants to take up carbon dioxide, which they use in photosynthesis or the process of food-making.
- Plants need stomata to release the oxygen formed during photosynthesis too.
- Hence, if the stomata are blocked, transpiration would not occur, and the leaves will remain fresh for a longer period.
- On Experimental leaf 2 , Vaseline was applied underneath the leaf, thus stomata get completely blocked thereby preventing transpiration. Hence it'll dry up last.