When the day light hours are increased, the rate of photosynthesis :
1. Increases
2. Decreases
3. Remains unchanged
4. At first increases then decreases
Subtopic: Â Factors Affecting Photosynthesis |
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In the thylakoid membranes, what is the main role of the antenna pigment molecules?
| 1. | split water and release oxygen to the reaction-center chlorophyll |
| 2. | harvest photons and transfer light energy to the reaction-center chlorophyll |
| 3. | synthesize ATP from ADP and Pi |
| 4. | transfer electrons to ferredoxin and then NADPH |
Subtopic: Â Photosynthetic Pigments |Â Light Reaction: Electron Transport |
 79%
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Given below are two statements:
| Assertion (A): | During Calvin cycle, regeneration of RuBP is crucial for uninterrupted cycle. |
| Reason (R): | RuBP in Calvin cycle acts as a CO2 acceptor. |
| 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: Â Dark Reaction : Calvin Cycle |
 76%
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Which statement describes the functioning of photosystem II?
| 1. | Light energy excites electrons in the thylakoid membrane electron transport chain. |
| 2. | Photons are passed along to a reaction-center chlorophyll. |
| 3. | The P680 chlorophyll donates a pair of protons to NADP+, which is thus converted to NADPH. |
| 4. | The electron vacancies in P680+ are filled by electrons derived from water. |
Subtopic: Â Light Reaction: Electron Transport |Â Light Reactions :1 |Â Light Reactions :2 |
 58%
From NCERT
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Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?
1. The light reactions provide ATP and NADPH to the Calvin cycle, and the cycle returns ADP, Pi, and NADP+ to the light reactions.
2. The light reactions provide ATP and NADPH to the carbon fixation step of the Calvin cycle, and the cycle provides water and electrons to the light reactions.
3. The light reactions supply the Calvin cycle with CO2 to produce sugars, and the Calvin cycle supplies the light reactions with sugars to produce ATP.
4. The light reactions provide the Calvin cycle with oxygen for electron flow, and the Calvin cycle provides the light reactions with water to split.
Subtopic: Â Light Reactions :1 |
 65%
From NCERT
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Given below are two statements:
| Assertion (A): | Six molecules of CO2 and twelve molecules of NADPH + H+ and 18 ATP are used to form one hexose molecules. |
| Reason (R): | Light reaction results in formation of ATP and NADPH2. |
| 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. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Â Dark Reaction: Biosynthetic Phase |Â Dark Reaction : Calvin Cycle |
 77%
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A:
Peroxisomes
participate in photorespiration in C4 plants.
R: Catalase enzyme is present in high concentration in peroxisomes
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
R: Catalase enzyme is present in high concentration in peroxisomes
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Â Questions on Photorespiration |
 58%
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Given below are two statements:
| Assertion (A): | For evolution of O2 in photosynthesis, PS-II is required. |
| Reason (R): | PS II is reduced by pulling electrons from water due to which photolysis of H2O occurs. |
| 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: Â Light Reaction: Electron Transport |Â Light Reactions :1 |
 80%
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A protein that spans the phospholipid bilayer one or more times is
1. a transmembrane protein.
2. an integral protein.
3. a peripheral protein.
4. an integrin.
1. a transmembrane protein.
2. an integral protein.
3. a peripheral protein.
4. an integrin.
Subtopic: Â Chemiosmotic hypothesis |
 61%
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Some photosynthetic organisms contain chloroplasts that lack photosystem II, yet are able to survive. The best way to detect the lack of photosystem II in these organisms would be
1. to determine if they have thylakoids in the chloroplasts.
2. to test for liberation of O2 in the light.
3. to test for CO2 fixation in the dark.
4. to do experiments to generate an action spectrum.
1. to determine if they have thylakoids in the chloroplasts.
2. to test for liberation of O2 in the light.
3. to test for CO2 fixation in the dark.
4. to do experiments to generate an action spectrum.
Subtopic: Â Light Reactions |
 70%
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