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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 can happen together because the diffusion coefficient of water and CO2 is different.
2. Both processes can happen together because there is no competition between water and CO2.
3. One process occurs during day time and the other at night.
4. Both processes cannot happen simultaneously.

Correct answer: Both processes can happen together because there is no competition between water and CO2.

Solution

Both water vapour and carbon dioxide can diffuse through the same stomatal pore at the same time. Their movement is driven by different concentration gradients, so one does not prevent the other from passing.

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