Q. No.Photosynthesis is important because:
| I: | It is the primary source of all food on earth. |
| II: | It is responsible for the release of oxygen into the atmosphere by green plants. |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
Subtopic: Factors Affecting Photosynthesis |
94%
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What will not be true for C4 plants when compared to C3 plants?
1. They have a special type of leaf anatomy
2. They tolerate higher temperatures
3. They show a response to very low light intensities
4. They lack a process called photorespiration
1. They have a special type of leaf anatomy
2. They tolerate higher temperatures
3. They show a response to very low light intensities
4. They lack a process called photorespiration
Subtopic: Photorespiration | Factors Affecting Photosynthesis | Light Reactions :1 | Light Reactions :2 | Light Reactions :3 |
92%
From NCERT
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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
Subtopic: Factors Affecting Photosynthesis |
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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: Factors Affecting Photosynthesis |
83%
From NCERT
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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: Factors Affecting Photosynthesis |
76%
From NCERT
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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: Factors Affecting Photosynthesis |
81%
From NCERT
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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: Factors Affecting Photosynthesis |
76%
From NCERT
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Consider the given two statements:
| Assertion (A): | Photosynthesis cannot be carried out in higher plants at very high temperatures. |
| Reason (R): | Carbon fixation is an enzyme mediated process and the enzymes would be denatured at very high temperatures. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True; (R) is False |
| 3. | (A) is False; (R) is False |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A). |
Subtopic: Factors Affecting Photosynthesis |
80%
From NCERT
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A plant is growing in an open field during a hot summer day. Which of the following limiting factor will have the greatest effect on photosynthesis carried out by this plant?
1. Carbon dioxide concentration
2. Light intensity
3. Temperature
4. Oxygen
1. Carbon dioxide concentration
2. Light intensity
3. Temperature
4. Oxygen
Subtopic: Factors Affecting Photosynthesis |
64%
From NCERT
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Consider the two statements:
| Statement I: | Current availability of CO2 levels is limiting to the C3 plants. |
| Statement II: | C3 plants show saturation at about \(360 ~\mu lL^{-1}\) |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is incorrect; Statement II is correct |
| 3. | Statement I is correct; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Factors Affecting Photosynthesis |
71%
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