Question

Assertion : The atmospheric concentration of $C{O}_2$ at which photosynthesis just compensates for respiration is referred to as $C{O}_2$ compensation point.
Reason : The $C{O}_2$ compensation point is reached when the amount of $C{O}_2$ uptake is less than that generated through respiration because the level of $C{O}_2$ in the atmosphere is more than that required for achieving $C{O}_2$ compensation point.

• A. If both Assertion and Reason are true and the reason is the correct explanation of the assertion.
• B. If both Assertion and Reason are true but the reason is not the correct explanation of the assertion.
• C. If Assertion is true statement but Reason is false.
• D. If both Assertion and Reason are false statements.

Answer 1

Answer: (C)

The point at which $C{O}_2$ released in respiration is exactly compensated by $C{O}_2$ fixed in photosynthesis is called compensation point. Since, the rate of fixation of $C{O}_2$ in photosynthesis just balances the rate of $C{O}_2$ released in respiration, the net photosynthesis is zero at compensation point.