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Question:

Stomatal opening is affected by:

Nitrogen concentration, carbon dioxide concentration and light.

Nitrogen concentration, light and temperature.

Carbon dioxide concentration, temperature and light.

Carbon dioxide concentration, nitrogen concentration and temperature.

Solution:

Stomatal opening is affected by carbon dioxide concentration, light, and temperature. Increase in the temperature causes stomata to open. Low CO2 concentration induces stomatal opening and vice versa. Stomata open in the presence of light and close in darkness.