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At constant temperature, the rate of transpiration will be higher at:

1. Sea level
2. 1 km below sea level
3. 1 km above sea level
4. 1.5 km above sea level

Correct answer: 1.5 km above sea level

Solution

Transpiration increases as atmospheric pressure decreases because water vapor diffuses out of the leaf more easily. Among the choices, the highest altitude has the lowest pressure, so it gives the highest transpiration rate.

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