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Q. No.Immediately after light becomes unavailable, the biosynthetic phase of photosynthesis continues for some time and then stops. If then, light is made available, the synthesis starts again. A logical conclusion of these observations will include:
I:
Biosynthetic phase does not directly depend on the presence of light.
II:
Biosynthetic phase depends on the products of light reactions.
III:
Biosynthesis phase occurs only in the dark or in the absence of light.
1.
Only I and II
2.
Only III
3.
Only II
4.
I, II and III
Subtopic: Dark Reaction: Biosynthetic Phase |
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In a photosystem:
| 1. | The reaction centre is where light is captured, while the antenna complex is where this light energy is transformed into chemical energy. |
| 2. | The antenna complex is where light is captured, while the reaction centre is where this light energy is transformed into chemical energy. |
| 3. | The antenna complex is where light energy is captured and transformed into chemical energy. |
| 4. | The reaction centre is where light energy is captured and transformed into chemical energy. |
Subtopic: Photosystems |
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Given below are two statements:
| Assertion (A): | The reaction centres in both photosystems in plants is the same. |
| Reason (R): | The reaction centres of both photosystems are formed by chlorophyll b molecules. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Light Reactions :1 |
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Consider the two statements:
| I: | The water-splitting complex is located on the inner side of the thylakoid membrane |
| II: | The NADP reductase enzyme is located on the stromal side of the thylakoid membrane |
| 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: Dark Reaction: Biosynthetic Phase |
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From NCERT
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Select the statements that will be true for C4 plants:
| I: | Calvin cycle takes place in Bundle sheath cells |
| II: | Number of carbon atoms in the primary carbon dioxide acceptor is 5 |
| III: | Initial carboxylation reaction occurs in mesophyll cells |
| IV: | Primary carbon dioxide fixation product is oxaloacetic acid |
| 1. | Only I, II and III | 2. | Only I, III and IV |
| 3. | Only II, III and IV | 4. | I, II, III and IV |
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
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Identify the option where the name of the scientist is not correctly matched with discovery related to understanding of the process of photosynthesis:
| 1. | Cornelius van Neil | Oxygen evolved comes from water |
| 2. | T W Engelmann | First absorption spectrum of chlorophyll a |
| 3. | Joseph Priestley | Plants restore to the air whatever breathing animals remove |
| 4. | Jan Ingenhousz | Sunlight is essential for photosynthesis |
Subtopic: Historical View: Experiments |
From NCERT
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What is not true regarding the factors affecting the rate of photosynthesis?
| 1. | There is a linear relationship between incident light and carbon dioxide fixation rates at low light intensities. |
| 2. | Current availability of carbon dioxide levels is limiting to the C4 plants. |
| 3. | C4 plants respond to higher temperatures and show higher rates of photosynthesis |
| 4. | Water stress causes the stomata to close, hence reducing the availability of carbon dioxide |
Subtopic: Factors Affecting Photosynthesis |
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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 |
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From NCERT
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The hypothesis “Plants restore to the air whatever breathing animals and burning candles remove” was given, after his experiments, by:
| 1. | Joseph Priestley | 2. | Jan Ingenhousz |
| 3. | Julius von Sachs | 4. | C. B. Van Neil |
Subtopic: Historical View: Experiments |
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Who first showed that it is only the green parts of the plants that could release oxygen during photosynthesis?
| 1. | Joseph Priestley | 2. | Jan Ingenhousz |
| 3. | Julius von Sachs | 4. | C. B. Van Neil |
Subtopic: Historical View: Experiments |
73%
From NCERT
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