Low level of CO2 favours _________ of the stomata.
Correct answer: A. Opening
- A. Opening
- B. Closure
- C. Both of these
- D. None of these
Explanation
Low carbon dioxide concentration, especially inside the leaf, promotes stomatal opening so that more CO2 can enter for photosynthesis. High internal CO2 generally signals that sufficient carbon dioxide is available and favours closure. Students may choose closure by confusing low CO2 with drought stress, which causes closure through water conservation.
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About Biological Importance of Water
Water supports life through its polarity, hydrogen bonding and ability to dissolve ionic and polar substances. Its high specific heat, heat of vaporization, cohesion, adhesion and incompressibility help regulate temperature, transport materials and maintain structure, while hydrolysis and osmosis depend directly on water.
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