Concept:Wilting causes stomatal closure, which limits gas exchange needed for photosynthesis.
Explanation:In a wilted herbaceous plant, water loss exceeds water uptake.
To reduce further water loss, the stomata close.
Closed stomata prevent carbon dioxide,
CO2, from entering the leaf.
Since
CO2 is a raw material for photosynthesis, its reduced availability lowers the rate of photosynthesis.
Thus, the drop in photosynthesis is due to decreased entry of carbon dioxide into the leaf.
Answer:D. amount of carbon dioxide entering the leaf decrease.