NEET 2016 Biology question

Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of following options:

(1)Both processes cannot happen simultaneously
(2)Both processes can happen together because the diffusion coefficient of water and is differentCorrect
(3)The above processes happen only during night time
(4)One process occurs during day time, and the other at night

Answer: (2)

Solution

Both gases diffuse through the same stomatal pores at the same time along their own concentration gradients: water vapour moves out because the air in the substomatal cavity is saturated and the outside air is drier, and CO moves in because its concentration inside the leaf is lower than in the air. The two fluxes

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Question ID VK-092000