allery**Stomatal transpiration** accounts for what fraction of total transpiration?
A~10%
B~50%
C~90% (and occurs only during daytime when stomata open)
D~99%
Answer & Solution
Correct answer: C. ~90% (and occurs only during daytime when stomata open)
Stomatal transpiration = 90–93% of total transpiration, occurring only during the day (most plants).
Desert CAM plants are an exception — stomata open at night.
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