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Q. No.What is the most important role that accessory pigments play in photosynthesis?
1.
They protect chlorophyll b from photodamage.
2.
They absorb light and transfer energy to chlorophyll.
3.
They catalyze the splitting of water.
4.
They fix carbon dioxide into sugars.
Subtopic: Photosynthetic Pigments |
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What is a critical difference between cyclic and non-cyclic photophosphorylation?
| 1. | Cyclic photophosphorylation produces ATP and NADPH, while non-cyclic produces only ATP. |
| 2. | Non-cyclic photophosphorylation involves both photosystems, while cyclic involves only one. |
| 3. | Cyclic photophosphorylation produces oxygen, whereas non-cyclic does not. |
| 4. | Non-cyclic photophosphorylation requires light, cyclic does not. |
Subtopic: Light Reaction: Photophosphorylation |
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What happens to the electrons of PS II in the electron transport chain during the light reaction of photosynthesis?
| 1. | They are stored in pigments of photosystem II. |
| 2. | They are used up during the process. |
| 3. | They pass through the electron transport chain and are transferred to pigments of photosystem I. |
| 4. | They combine directly with NADP+ to form NADPH. |
Subtopic: Light Reaction: Electron Transport |
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What is the final electron acceptor in the electron transport chain during the light reaction?
1. NADP+
2. ATP
3. Oxygen
4. Water
1. NADP+
2. ATP
3. Oxygen
4. Water
Subtopic: Light Reaction: Electron Transport |
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What is the Z scheme in the context of photosynthesis?
| 1. | The process of ATP formation. |
| 2. | The movement of electrons downhill in redox potential scale from PS II to PS I and then to NADP+. |
| 3. | The shape of chlorophyll molecule. |
| 4. | The pathway of carbon fixation. |
Subtopic: Light Reaction: Electron Transport |
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Why is the shape of the electron transport process termed the Z scheme?
| 1. | Because of the zig-zag shape of the pathway. |
| 2. | Due to the characteristic shape of the energy levels when all carriers are placed in sequence on a redox potential scale. |
| 3. | Because it represents the structure of chlorophyll. |
| 4. | Due to the shape of the ATP synthase enzyme. |
Subtopic: Light Reaction: Electron Transport |
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What role does chlorophyll b play in photosynthesis?
| 1. | It acts as the primary pigment absorbing light for photosynthesis. |
| 2. | It assists chlorophyll a by expanding the range of light wavelengths that can be absorbed. |
| 3. | It is directly involved in the conversion of light energy to chemical energy. |
| 4. | It protects chlorophyll a from photodamage by dissipating excessive light. |
Subtopic: Photosynthetic Pigments |
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Rubisco enzyme is involved in two activities, which are:
| 1. | Photolysis of water and carbon fixation |
| 2. | Carbon fixation and oxygenation of RuBP |
| 3. | ATP synthesis and NADPH formation |
| 4. | Oxygen evolution and reduction of carbon dioxide |
Subtopic: Dark Reaction : Calvin Cycle |
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Consider the given two statements:
| Assertion (A): | Kranz anatomy is crucial for the efficiency of C4 plants. |
| Reason (R): | Kranz anatomy allows for a higher concentration of carbon dioxide at the site of the Calvin cycle. |
| 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. | (A) is False but (R) is True. |
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
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What is the key difference between the reaction center chlorophyll molecule and other pigment molecules in a photosystem?
| 1. | Reaction center chlorophyll molecules are less abundant than other pigments. |
| 2. | Only reaction center chlorophyll molecules can transfer the excited electron to an electron acceptor. |
| 3. | Other pigment molecules do not participate in the light reactions of photosynthesis. |
| 4. | Reaction center chlorophyll molecules are located in the stroma, while other pigments are in the thylakoid membrane. |
Subtopic: Light Reaction: Electron Transport |
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