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Standard XII
Biology
Blackman's Law of Limiting Factor
Question

The intensity of light beyond a particular limit is unable to increase the rate of photosynthesis. The phenomena is known as
  1. Light saturation intensity.
  2. Light compensation point.
  3. Solarization.
  4. None of the above.

A
Solarization.
B
Light saturation intensity.
C
Light compensation point.
D
None of the above.
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Solution
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Blackman's law of limiting factors describes 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. When the level of CO2 is maintained constant and the value of light intensity is reduced, the rate of reaction increases with increase in light intensity. There is a point where there is saturation of the light intensity called as light saturation intensity. This is the point beyond which there is no increase in the rate of photosynthesis.
Thus, the correct answer is option B.

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