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What share of the water taken up by roots may be lost through transpiration?
AUp to 30 percent
BUp to 50 percent
CUp to 70 percent
DUp to 90 percent
Answer & Solution
Correct answer: D. Up to 90 percent
1. The atmosphere that drives transpiration also causes massive water loss from the plant.
2. Up to 90 percent of the water taken up by roots may be lost this way.
3. That is why regulation of transpiration through stomatal opening and closing matters so much.
4. The waxy cuticle prevents loss across the rest of the leaf surface, leaving the stomata as the controlled route.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.5 Transport of Water and Solutes in Plants_
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