- 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 |
Subtopic: Â Factors Affecting Photosynthesis |
 83%
Level 1: 80%+
Hints
The factors that can be limiting for the light independent reactions of photosynthesis are:
| 1. | CO2, temperature, and light |
| 2. | CO2, light, and water |
| 3. | water, temperature, and CO2 |
| 4. | oxygen, water, and temperature |
Subtopic: Â Factors Affecting Photosynthesis |
Level 3: 35%-60%
Hints
Consider the given two statements:
| 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 |
Subtopic: Â Factors Affecting Photosynthesis |
 79%
Level 2: 60%+
Hints
Consider the given two statements:
| 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 |
Subtopic: Â Factors Affecting Photosynthesis |
 82%
Level 1: 80%+
Hints
What percentage in atmosphere of carbon dioxide can become damaging to plants over long periods?
| 1. | 0.03 to 0.04 | 2. | 0.04 to 0.05 |
| 3. | 0.05 | 4. | more than 0.05 |
Subtopic: Â Factors Affecting Photosynthesis |
 77%
Level 2: 60%+
Hints
Water affects the process of photosynthesis in higher plants because:
| 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 |
Subtopic: Â Factors Affecting Photosynthesis |
 92%
Level 1: 80%+
Hints
- 1(current)
Q. No.
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