- 1(current)
Q. No.Except for plants in shade or in dense forests, light is rarely a limiting factor in nature. This is because:
1. Dark reactions do not depend on light
2. The rate of photosynthesis can be increased by higher carbon dioxide and lower temperatures even in low light conditions
3. Light saturation occurs at 10 % of full sunlight
4. Carbon fixation is independent of enzymes
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The factors that can be limiting for the light independent reactions of photosynthesis are:
1. , temperature, and light
2. , light, and water
3. water, temperature, and
4. oxygen, water, and temperature
Statement I: Despite the presence of a green leaf, optimal light and carbon dioxide conditions, the plant may not photosynthesize if the temperature is very low.
Statement II: If a chemical process is affected by more than one factor, then its rate will be determined by the factor which is nearest to its minimal value.
1. Both Statement I and Statement II are correct and Statement II explains Statement I
2. Both Statement I and Statement II are correct but Statement II does not explain Statement I
3. Statement I is correct but Statement II is incorrect
4. Statement I is incorrect but Statement II is correct
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| Statement I: | Green house crops such as tomatoes and bell pepper are allowed to grow in carbon dioxide enriched atmosphere. This leads to higher yields. |
| Statement II: | C3 plants respond to higher carbon dioxide concentration by showing increased rates of photosynthesis, leading to higher productivity. |
| 1. | Both Statement I and Statement II are correct and Statement II explains Statement I |
| 2. | Both Statement I and Statement II are correct but Statement II does not explain Statement I |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
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| 1. | 0.03 to 0.04 | 2. | 0.04 to 0.05 |
| 3. | 0.05 | 4. | more than 0.05 |
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| I: | Water stress can cause the stomata to close, hence, reducing the carbon dioxide availability. |
| II: | Water stress also makes leaves wilt, thus, reducing the surface area of the leaves and their metabolic activity as well. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
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- 1(current)
Q. No.
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