Plants Lose Several Hundred H₂O Molecules for Each CO₂ That

question 138

Multiple Choice

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.

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