Question

The saturation point of CO₂ In C₄ plants is

• A. 360 μl/L
• B. 390 μl/L
• C. 450 μl/L
• D. 460 μl/L

Answer 1

The correct option is A

360 μl/L

The correct option is A.

Explanation of correct option:

1. The marginal or terminal point of any plant from which further photosynthesis or the uptake of any other chemicals is prohibited is known as the saturation point of plants.
2. When carbon dioxide levels reach a certain level, photosynthesis stops increasing.
3. Plants can use light more efficiently and attain saturation by introducing carbon dioxide to the air, which also helps.
4. 360 μl/L is the optimal carbon-dioxide concentration.
5. The higher effectiveness of fixing carbon dioxide by PEP-carboxylase is what accounts for the low saturation point in C₄ plants as compared to C₃ plants.

Explanation of incorrect options:

Option B:

1. 390 μl/L is the carbon-dioxide saturation point in C₄ plants is typically low.
2. The lower saturation point is due to the increased efficiency of carbon-dioxide fixation.
3. As a result, option B is incorrect.

Option C:

1. 450 μl/L is the optimal carbon-dioxide concentration for C₃ plants.
2. As a result, it can't be the saturation point for C₄ plants.
3. So option C is incorrect.

Option D:

1. 460 μl/L - atmospheric carbon-dioxide saturation is around 0.039 percent.
2. It has a high proportion of gases in the atmosphere, such as nitrogen.
3. It accounts for eighty percent of all atmospheric gases.
4. As a result, option C is incorrect.

Final answer: The saturation point Of CO₂ In C₄ plants is 360 μl/L.