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Q. No.Identify the incorrect statement regarding the enzyme PEP carboxylase:
1.
PEP carboxylase has a lower Km for bicarbonate ions, hence, higher affinity — than RuBisCO.
2.
O2 is a very poor substrate for this enzyme.
3.
It plays an important role in C4 cycle but not in CAM plants.
4.
PEP carboxylase is also significant in non-photosynthetic metabolic pathways.
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
55%
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NEET 2025 - Target Batch
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NEET 2025 - Target Batch
What can occur during both photosynthesis and respiration?
I: The reduction of oxygen that forms water.
II: Formation of ATP by chemiosmosis
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | None |
Subtopic: Chemiosmotic hypothesis |
59%
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NEET 2025 - Target Batch
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Carbon dioxide splits to form oxygen during:
1. photosynthesis.
2. respiration.
3. photorespiration.
4.None.
Subtopic: Light Reaction: Electron Transport | Light Reactions |
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NEET 2025 - Target Batch
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NEET 2025 - Target Batch
Identify the correct statements regarding factors affecting photosynthesis:
| I: | At very high light intensities chlorophyll damage can occur due to photo-oxidation. |
| II: | Affinity for carbon dioxide of the enzyme RuBisCO is reduced at higher temperatures. |
| III: | The current availability of carbon dioxide may be a limiting factor for C3 plants. |
| IV: | If leaf undergoes senescence, loss of chlorophyll occurs. |
| 1. | I, II and III only | 2. | I, II and IV only |
| 3. | II, II and IV only | 4. | I, II, III and IV |
Subtopic: Factors Affecting Photosynthesis |
66%
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NEET 2025 - Target Batch
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Probably the strongest biological oxidizing agent is P680+ because:
| 1. | It accepts electron in both photosystems. |
| 2. | It transfers electrons to plastoquinone. |
| 3. | It strongly attracts electrons formed by the splitting of water. |
| 4. | It transfers electrons to plastocyanin. |
Subtopic: Light Reaction: Electron Transport |
73%
From NCERT
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NEET 2025 - Target Batch
What conclusion can be drawn from the finding that while some bacteria have only photosystem I, cyanobacteria have both?
| 1. | Photosystem II was lost in some species as it was selected against by the nature. |
| 2. | Photosystem I must be more ancestral. |
| 3. | Photosystem II may have evolved to be more photoprotective. |
| 4. | Cyclic photphosprolylation is more important than non cyclic photophosphorylation. |
Subtopic: Photosystems |
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The functions of carotenoids similar to their function in humans would be:
| 1. | Accessory pigments to harvest light energy. |
| 2. | Dissipation of excessive light energy. |
| 3. | Antibacterial in nature. |
| 4. | Removal of toxins from water. |
Subtopic: Pigments |
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NEET 2025 - Target Batch
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In chloroplasts the part of the ATP synthase is located:
| 1. | on the side facing the thylakoid space. |
| 2. | on the ATP molecules themselves. |
| 3. | on the pigment molecules of PS I and PS II. |
| 4. | on the stroma side of the membrane. |
Subtopic: Chemiosmotic hypothesis |
75%
From NCERT
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Hints
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NEET 2025 - Target Batch
Identify the correct statement:
| 1. | The light reactions provide ATP and NADPH to the Calvin cycle. |
| 2. | The light reactions provide to the Calvin cycle. |
| 3. | The light reactions supply oxygen to the Calvin cycle. |
| 4. | Calvin cycle is in no way dependent on the light reactions. |
Subtopic: Light Reaction: Electron Transport |
86%
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The primary function of the Calvin cycle is to:
| 1. | use ATP to release carbon dioxide |
| 2. | use NADPH to release carbon dioxide |
| 3. | split water and release oxygen |
| 4. | fix inorganic carbon to simple sugars |
Subtopic: Dark Reaction : Calvin Cycle |
82%
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