Statement I : Water stress causes stomatal closure, it reduces $C O_{2}$ availability.
Statement II : At low light condition neither group ( $C_{3}, C_{4}$ ) responds to high $C O_{2}$ conditions. At high light intensities, both $C_{3}$ and $C_{4}$ plants show increase in rates of photosynthesis.

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Statement I is correct, Statement II is Wrong

Both Statement I and Statement II are wrong

Both Statement I and Statement II are true

Statement I is wrong, Statement II is correct

answer is B.

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Detailed Solution

NCERT XI PAGE 223.

Water stress causes the stomata to close, hence reducing CO2 availability. Besides, water stress also makes leaves wilt, thus, reducing the surface area of the leaves and their metabolic activity as well.

At low light conditions, since light becomes a limiting factor, neither group ( $C_{3}, C_{4}$ ) responds to high $C O_{2}$ Conditions.

At high light intensities, both $C_{3}$ and $C_{4}$ Plants show an increase in rates of photosynthesis.

As the light intensity increases, there is an increase in the rate of photosynthesis (linear relationship) but, a particular limit. After that, at very high intensities, the rate of photosynthesis reaches constant.

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