IMMUNOGLOBULINS
CLASSICAL ALTERNATE AND LECTIN PATHWAYS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When not enough oxygen is available
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When there is not enough water
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When there is not enough carbon dioxide
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None of the above
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Detailed explanation-1: -Stomata can be opened or closed depending on the turgidity of guard cells. The closing and opening of the stomata depend upon the concentration of carbon dioxide in the air. It is so because when carbon dioxide levels are below normal, i.e., about 0.03 percent, the guard cells become turgid and the stomata enlarge.
Detailed explanation-2: -A high CO2 C O 2 concentration in leaf mesophyll causes the stomata to close as there is more than enough carbon dioxide in the leaf for photosynthesis to continue and thus the leaf does not need to gain more carbon dioxide.
Detailed explanation-3: -General Molecular Mechanism Generally, ion and organic solute concentration levels determine the turgor pressure of guard cells and subsequently affect stomatal aperture. Under elevated CO2, stomata tend to close because a greater depolarization seems to appear in GCs.