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Q. No.When the ratio of carbon dioxide and oxygen in the vicinity of RuBisCO is 1, the affinity of the enzyme:
1.
is nearly nil for oxygen
2.
is about equal for both carbon dioxide and oxygen
3.
is much greater for oxygen than carbon dioxide
4.
is much greater for carbon dioxide than oxygen
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
65%
From NCERT
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T.W. Engelmann:
| 1. | described a first action spectrum of photosynthesis |
| 2. | provided evidence for production of glucose when plants grow |
| 3. | showed that it is only the green parts of the plant that can release oxygen |
| 4. | first showed that oxygen evolved by the green plant comes from water, not from carbon dioxide |
Subtopic: Historical View: Experiments |
90%
From NCERT
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In non-cyclic photo-phosphorylation:
| 1. | only PS I is functional |
| 2. | both photosystems work in series, first PS I and then PS II |
| 3. | only ATP synthesis takes place and NADPH is not synthesized |
| 4. | both ATP and NADPH are synthesized |
Subtopic: Light Reaction: Electron Transport |
78%
From NCERT
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In Sorghum:
| 1. | Calvin cycle takes place in Mesophyll cells |
| 2. | Initial carboxylation reaction occurs in Bundle sheath cells |
| 3. | Number of carbon atoms in the primary carbon dioxide acceptor is 3 |
| 4. | PGA is the primary carbon dioxide fixation product |
Subtopic: C4 Cycle (Hatch & Slack Pathway) | C4 Plants Examples |
64%
From NCERT
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The oxygen evolving complex is associated with:
| 1. | PS I | 2. | PS II |
| 3. | Both 1 and 2 | 4. | Neither 1 nor 2 |
Subtopic: Light Reaction: Electron Transport |
81%
From NCERT
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Which one of the following is not true regarding the release of energy during ATP synthesis through chemiosmosis?
It involves:
It involves:
| 1. | Reduction of NADP to NADPH2 on the stroma side of the membrane |
| 2. | Breakdown of proton gradient |
| 3. | Breakdown of electron gradient |
| 4. | Movement of protons across the membrane to the stroma |
Subtopic: Chemiosmotic hypothesis |
75%
From NCERT
NEET - 2022
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NEET 2025 - Target Batch
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Given below are two statements:
In the light of the above statements, choose the correct answer from the options given below :
| Statement I: | The primary \(CO_2\) acceptor in \(C_4\) plants is phosphoenolpyruvate and is found in the mesophyll cells. |
| Statement II: | Mesophyll cells in \(C_4\) plants lack RuBisCO enzyme. |
| 1. | Statement I is incorrect but Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct but Statement II is incorrect. |
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
82%
From NCERT
NEET - 2022
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NEET 2025 - Target Batch
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What is the role of large bundle sheath cells found around the vascular bundles in C4 plants?
| 1. | To protect the vascular tissue from high light intensity. |
| 2. | To provide the site for photorespiratory pathway. |
| 3. | To increase the number of chloroplast for the operation of Calvin cycle. |
| 4. | To enable the plant to tolerate high temperature. |
Subtopic: Question on C4 Pathway |
From NCERT
NEET - 2022
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NEET 2025 - Target Batch
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The products of light reaction in photosynthesis are:
| 1. | ATP, NADPH and \(\text{O}_2\) |
| 2. | ATP, NADPH, \(\text{O}_2\) and \(\text{H}_2 \text{O}\) |
| 3. | ATP, NADPH and \(\text{H}_2 \text{O}\) |
| 4. | ATP, NADPH and \(\text{CO}_2\) |
Subtopic: Light Reaction: Electron Transport | Light Reactions |
79%
From NCERT
NEET - 2022
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The ratio of carbon dioxide fixation between C4 plants and C3 plants is :
| 1. | 2:1 | 2. | 2: 3 |
| 3. | 1:1 | 4. | 1:2 |
Subtopic: Dark Reaction : Calvin Cycle | C4 Cycle (Hatch & Slack Pathway) |
57%
From NCERT
NEET - 2022
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