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Q. No.Identify the incorrect statement regarding non-cyclic photophosphorylation:
1.
Being a light reaction, non-cyclic photophosphorylation occurs in the thylakoid membrane.
2.
The photosystem II complex replaces its lost electrons from an external source.
3.
It generates both ATP and NADPH
4.
When the chloroplast runs low on ATP for the Calvin cycle, the plant may shift from cyclic to non-cyclic electron flow.
Subtopic: Light Reaction: Electron Transport |
67%
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NEET 2025 - Target Batch
Hints
Identify the incorrect statement regarding the light independent reactions in photosynthesis:
| 1. | These reactions occur in the stroma. |
| 2. | They use the products (ATP and NADPH) of light-dependent reactions. |
| 3. | They occur in the absence of light and hence are called the dark reactions. |
| 4. | The three phases are carbon fixation, reduction reactions, and ribulose 1,5-bisphosphate (RuBP) regeneration. |
Subtopic: Dark Reaction: Biosynthetic Phase |
81%
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NEET 2025 - Target Batch
Hints
The number of electrons that need to be transported during cyclic photophosphorylation in sulphur bacteria, to produce one molecule of ATP is:
1. one
2. two
3. three
4. four
Subtopic: Light Reaction: Photophosphorylation |
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NEET 2025 - Target Batch
Hints
The antenna pigment molecules:
| 1. | are responsible for photolysis of water to release oxygen |
| 2. | harvest photons and transfer light energy to the reaction-center chlorophyll |
| 3. | transfer electrons to chlorophyll a |
| 4. | transfer electrons to ferredoxin and then NADPH |
Subtopic: Photosynthetic Pigments |
76%
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NEET 2025 - Target Batch
Hints
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NEET 2025 - Target Batch
The number of turns of Calvin cycle required to produce one molecule of Glyceraldehyde 3 Phosphate is:
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 6 |
Subtopic: Dark Reaction : Calvin Cycle |
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NEET 2025 - Target Batch
Hints
The light independent reactions are seen in:
| I. | C3 carbon fixation |
| II. | C4 carbon fixation |
| III. | Crassulacean acid metabolism |
| 1. I and II only | 2. I and III only |
| 3. II and III only | 4. I, II and III |
Subtopic: Dark Reaction: Biosynthetic Phase |
71%
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NEET 2025 - Target Batch
Hints
In the light dependent reactions of photosynthesis:
| 1. | NADPH is reduced to NADP+ by the enzyme NADP reductase |
| 2. | initial carbon fixation takes place forming a 3 carbon compound. |
| 3. | ATP is not produced. |
| 4. | light is absorbed and energy is transported to reaction-center chlorophyll a |
Subtopic: Light Reaction: Electron Transport |
70%
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NEET 2025 - Target Batch
Hints
The number of molecules of NADPH and ATP required respectively to reduce six molecules of carbon dioxide to glucose in Calvin cycle?
| 1. | 6 and 6 | 2. | 12 and 12 |
| 3. | 12 and 18 | 4. | 18 and 12 |
Subtopic: Dark Reaction : Calvin Cycle |
79%
From NCERT
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NEET 2025 - Target Batch
Hints
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NEET 2025 - Target Batch
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 |
86%
From NCERT
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NEET 2025 - Target Batch
Hints
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NEET 2025 - Target Batch
Consider the following two statements regarding RuBisCO:
| I: | When carbon dioxide is the substrate, the product of the carboxylase reaction is finally two molecules of glycerate-3-phosphate. |
| II: | When molecular oxygen is the substrate, the products of the oxygenase reaction are two molecules of phosphoglycolate. |
| 1. | Only I is correct | 2. | Only II is correct |
| 3. | Both I and II are correct | 4. | Both I and II are incorrect |
Subtopic: Dark Reaction : Calvin Cycle | Questions on Photorespiration |
51%
From NCERT
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NEET 2025 - Target Batch
Hints
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NEET 2025 - Target Batch
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