Biology for IGCSE & O level - Plant Nutrition (Section 7 - No. 32)
What do guard cells do during the day?
They close the stomata to prevent water loss.
They open the stomata to allow for gas exchange.
They actively transport sugars
They absorb sunlight for the leaf
Explanation
During the day, guard cells open stomata to let carbon dioxide in and oxygen and water vapor out.
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