The increase in the ........... factor greatly ........... the rate of photosynthesis.

Slowest, increases

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Slowest, decreases

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fastest, increases

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None of the above

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Solution

The correct option is A Slowest, increases
Blackman's law of limiting factors are the various factors which affect the rate of photosynthesis. It is considered that when the other factors are constant, the factor which is least or minimum has the direct effect on the rate of photosynthesis. The factor which have the slowest pace have maximum effects on the rate of photosynthesis. There is increase in the rate of photosynthesis due to this factor.
Thus, the correct answer is option A.

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