A, B and C respectively show the experimental results of exploring the effects of several environmental factors on the photosynthetic rate of potatoes. The answer is A, why is B wrong?

A: P is the light intensity and Q is the temperature. The experiment shown in Figure A mainly studies the effect of temperature on the photosynthetic rate of potato, and there is no light intensity.

B: That's right. At this point, it is only affected by light intensity and temperature.

C: The light intensity is not its influencing factor. At point Q in Figure B, under the condition of high CO2 concentration, the photosynthetic rate of potato can be improved by properly adjusting the ambient temperature.

The trend of the three curves after Q point in d:C diagram decreases gradually.

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