Q. No.The correct statements about photosynthesis include:
I. the light-dependent reactions can occur only in the light, the light-independent reactions only in the dark
II. photorespiration is more efficient at producing glucose than is photosynthesis
III. the light-dependent reactions produce the energy-rich compounds that are used to run the light-independent reactions
| 1. | I only | 2. | III only |
| 3. | I and III only | 4. | II and III only |
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The electrons needed to replace those removed from PS I are provided by:
| 1. | The LHC | 2. | Water |
| 3. | NADPH | 4. | PS II |
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The stroma lamellae membranes:
1. have both PS II and NADP reductase enzyme
2. have PS II but not NADP reductase enzyme
3. lack PS II but have NADP reductase enzyme
4. lack both PS II and NADP reductase enzyme
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Oxygen, during oxygenic photosynthesis, is produced during:
1. cyclic photophosphorylation
2. the light-dependent reactions involving photosystems I and II
3. Calvin cycle
4. the Krebs cycle
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In oxygenic photosynthesis, the release of oxygen is a byproduct of:
1. chemiosmosis
2. reducing by FNR
3. splitting the water molecules
4. cyclic photophosphorylation
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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.
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The extra ATP required [as compared to NADPH] in Calvin cycle comes from:
| 1. | photosystem II | 2. | photosystem I |
| 3. | cyclic electron flow | 4. | non cyclic electron flow |
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The correct sequence of flow of electrons in the light reaction is
| 1. | PSII, plastoquinone, cytochromes, PS I, ferredoxin |
| 2. | PSI, plastoquinone, cytochromes, PS II, ferredoxin |
| 3. | PSI, ferredoxin, PS II, |
| 4. | PSI, plastoquinone, cytochromes, PS II, ferredoxin |
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Consider the following two statements and choose the correct response from the options given below:
I. Protons and oxygen formed by splitting of water are released in the lumen of thylakoid.
II. PS II is physically located on the inner side of the membrane of the thylakoid.
1. Both I and II are true and II explains I
2. Both I and II are true but II does not explain I
3. I is true and II is false
4. I is false and II is true
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I. The whole scheme of transfer of electrons, starting from the PS II, uphill to the acceptor, down the electron transport chain to PS I, excitation of electrons, transfer to another acceptor, and finally down-hill to NADP+ reducing it to NADPH + H+ is called the Z scheme.
II. The electrons that are moved from photosystem II get replaced by electrons available due to splitting of water.
| 1. Only I | 2. Only II |
| 3. Both I and II | 4. Neither I nor II |
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