Plants lose several hundred H2O molecules for each CO2 that is fixed by photosynthesis because:
A) the concentration gradient is many times larger for H2O than for CO2.
B) H2O molecules are lighter than CO2 molecules and thus diffuse faster.
C) H2O molecules are consumed during photosynthesis.
D) the evaporation of so many H2O molecules is necessary to keep photosynthesis at its optimum temperature.
Correct Answer:
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