Q. No.The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is :
| 1. | cytochrome | 2. | iron-sulphur protein |
| 3. | ferredoxin | 4. | quinone |
In photosystem-I, the first electron acceptor is :
| 1. | ferredoxin | 2. | cytochrome |
| 3. | plastocyanin | 4. | an iron-sulphur protein |
The first step for initiation of photosynthesis will be
| 1. | Photolysis of water |
| 2. | Excitement of chlorophyll molecule due to absorption of light |
| 3. | ATP formation |
| 4. | Glucose formation |
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Read the following four statements a, b, c and d and select the right option having both correct statements:
| (a) | Z scheme of light reaction takes place in presence of PS I only |
| (b) | Only PS I is functional in cyclic photophosphorylation |
| (c) | Cyclic photophosphorylation results into synthesis of ATP and NADPH |
| (d) | Stroma lamellae lack PS II as well as NADP reductase |
Options :
| 1. | (c) and (d) |
| 2. | (b) and (d) |
| 3. | (a) and (b) |
| 4. | (b) and (c) |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | The reaction center of PS I is known as P700 and the reaction center of PS II is known as P680. |
| Reason (R): | PS I functions first in the light reactions. |
In the light of the above statements choose the correct answer from the options given below:
| 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. |
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| Assertion(A): | The electrons of NADPH are more readily available for the reactions of Calvin cycle than those of water. |
| Reason(R): | Two electrons are required for the reduction of NADP+ to NADPH. |
| 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 |
| Assertion(A): | Mutant plants that are not able to carry out cyclic electron flow do not grow well in intense light conditions. |
| Reason(R): | Cyclic electron flow may be photoprotective. |
| 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. |
Assertion: Plastocyanin moves within the thylakoid membranes and plastoquinones move through the thylakoid lumen.
Reason: Plastocyanin is lipid soluble while plastoquinones are not.
| 1. | Both assertion and reason are true and the reason is the correct explanation of the assertion. |
| 2. | Both assertion and reason are true but the reason is not the correct explanation of the assertion. |
| 3. | Assertion is true but reason is false. |
| 4. | Both assertion and reason are false |
| Assertion(A): | Plants photosynthesise during the day, whereas they respire at night. |
| Reason(R): | Photosynthesis can occur in the presence of sunlight whereas respiration cannot. |
| 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. |
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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