Question

During daylight hours, the rate of photosynthesis is higher than that of respiration and the ratio of oxygen produced to that of consumed is

• A. 1:1
• B. 10:1
• C. 50:1
• D. 5:1

Answer 1

The correct option is B 10:1

Maximum rate of photosynthesis occurs near noon when light is brightest and at this time, plants usually fix about eight times more $C{O}_2$ than is released during respiration. The amount of oxygen released is much more than being used up .Thus, during daytime when there is bright sunlight the ratio of oxygen produced to that of consumed is 10 : 1.