Q. No.Light dependent reactions are so called because they require light:
| 1. | to provide electrons for the process |
| 2. | to split the water molecule |
| 3. | to impart energy to the electrons in the reaction center |
| 4. | to hydrolyse ATP molecules |
Subtopic: Light Reaction: Electron Transport |
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Photochemical phase of oxygenic photosynthesis does not include:
1. Light absorption
2. Water splitting
3. Formation of ATP and NADPH
4. Synthesis of sugar
1. Light absorption
2. Water splitting
3. Formation of ATP and NADPH
4. Synthesis of sugar
Subtopic: Light Reaction: Electron Transport |
93%
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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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What is the site of the light-dependent reactions in photosynthesis in higher plants?
1. Stroma of chloroplasts
2. Thylakoid membrane
3. Lumen of thylakoid
4. Intermembrane space
1. Stroma of chloroplasts
2. Thylakoid membrane
3. Lumen of thylakoid
4. Intermembrane space
Subtopic: Light Reaction: Electron Transport |
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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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Identify the correct statement regarding the functioning of photosystem II?
| 1. | The reaction center is P700. |
| 2. | It works after PS I in non cyclic photophosphorylation. |
| 3. | Water splits and carbon dioxide is released. |
| 4. | The electron vacancies in P680 are filled by electrons derived from water. |
Subtopic: Light Reaction: Electron Transport |
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Consider the given two statements:
1. Only I
2. Only II
3. Both I and II are correct
4. Neither I nor II
| I: | Water splitting complex is associated with PSII in photosynthetic plants. |
| II: | Chlorophyll a reaction center in PSII is called as P680 |
2. Only II
3. Both I and II are correct
4. Neither I nor II
Subtopic: Photosystems | Light Reaction: Electron Transport |
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