Stomata close during high intensity light to prevent excessive transpiration but why did they close during low intensity of light? Please explain in easy- understand language because i'm in just 10th standard.
The primary function of open stomata is to promote gas exchange in leaf tissue: atmospheric carbon dioxide is a substrate for photosynthesis. A side effect of opening the stomata is an increase of water loss through transpiration. If light intensity is low then photosynthesis will be depressed: under these conditions it makes sense to close the stomata to conserve water.