A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: E
Solution :
\[C{{O}_{2}}\]concentration of the atmosphere is 0.03% (now 0.034%) or 300 ppm. Increase in its concentration upto only 0.1% increases the rate of photosynthesis in most, land plants. When \[C{{O}_{2}}\]concentration is reduced, there comes a point at which illuminated plant parts stop absorbing\[C{{O}_{2}}\]from their environment. It is known as \[C{{O}_{2}}\]compensation point or threshold value. At this value \[C{{O}_{2}}\]fixed in photosynthesis is equal to \[C{{O}_{2}}\]evolved in respiration and photorespiration. Photosynthesis is an anabolic process of manufacture of organic compounds inside the chlorophyll containing cells from carbon dioxide and water with the help of sunlight as a source of energy. Thus the main substrate is\[C{{O}_{2}}\], which on fixation gives rise to hexoses, sugar.
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