8. Which of these curves corresponds with the highest photosynthetic efficiency?



Leaf B has the highest efficiency because the slope of the response curve at low light levels is greater than for the other two leaves. Note that when describing the photosynthetic efficiency, we are only concerned with the slope of the line, not the maximal rate of photosynthesis. Thus, although leaf A has a lower efficiency, it can sustain higher maximum rates of photosynthesis than leaf B.


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