Photosynthesis In Higher Plants Question 22
Assertion : The atmospheric concentration of $ CO_2 $ at which photosynthesis just compensates for respiration is referred to as $ CO_2 $ compensation point. Reason : The $ CO_2 $ compensation point is reached when the amount of $ CO 2 $ uptake is equal to that generated through respiration because the level of $ CO_2 $ in the atmosphere is less than that required for achieving $ CO_2 $ compensation point.
Options:
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
Show Answer
Answer:
Correct Answer: C
Solution:
At very low $ CO_2 $ concentration photosynthesis is strongly limited by the low $ CO_2 $ while respiratory rates are unaffected.
As a result there is a negative balance between $ CO_2 $ fixed by photosynthesis and $ CO_2 $ produced by respiration and a net efflux of $ CO_2 $ at the compensation point.
By increasing the atmospheric concentration of $ CO_2 $ at which photosynthesis just compensates for respiration is referred to as $ CO_2 $ compensation point.
BETA
