Question

Increase O2 concentration

• A. Increases the rate of photosynthesis
• B. Decreases the rate of photosynthesis
• C. Does not affect the rate of photosynthesis
• D. Some time affect the rate of photosynthesis

Answer 1

The correct option is B

Decreases the rate of photosynthesis

The correct option is B:
The explanation for the correct option:

1. Photosynthesis is the process that involves the synthesis of organic food from inorganic substances with the help of chlorophyll in the presence of sunlight.
2. The rate of photosynthesis decreases with the increase in the oxygen concentration in the atmosphere.
3. This is due to the increasing competition between carbon dioxide and oxygen to bind with Rubisco.
4. This enzyme aids the conversion of carbon dioxide to glucose.
5. High oxygen concentration disables the carbon dioxide fixation resulting in a reduced photosynthetic yield in plants.

Final answer: The rate of photosynthesis decreases with the increase in oxygen concentration.