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Q. No.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: 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: Photosynthetic Pigments | Light Reaction: Electron Transport |
81%
From NCERT
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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: Dark Reaction : Calvin Cycle |
77%
From NCERT
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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: Light Reaction: Electron Transport | Light Reactions :1 | 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: Light Reactions :1 |
66%
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: Dark Reaction: Biosynthetic Phase | Dark Reaction : Calvin Cycle |
79%
From NCERT
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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) |
Subtopic: 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: Light Reaction: Electron Transport | Light Reactions :1 |
81%
From NCERT
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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: Chemiosmotic hypothesis |
59%
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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. |
Subtopic: Light Reactions |
70%
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