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Q. No.Van Niel, based on his studies of purple and green bacteria, demonstrated that photosynthesis is essentially a light-dependent reaction in which hydrogen from a suitable oxidisable compound reduces CO2 to carbohydrates. This can be expressed by:
\(2 \mathrm{H}_2 \mathrm{~A}+\mathrm{CO}_2 \xrightarrow{\text { Light }} 2 \mathrm{~A}+\mathrm{CH}_2 \mathrm{O}+\mathrm{H}_2 \mathrm{O}\)
Compare this with the correct equation for photosynthesis:
\(6 \mathrm{CO}_2+12 \mathrm{H}_2 \mathrm{O} \xrightarrow{\text { Light }} \mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+6 \mathrm{H}_2 \mathrm{O}+6 \mathrm{O}_2\)
Based on the comparison, which of the following will be correct?
I:
In green plants H2O is the hydrogen donor and is oxidised to O2.
II:
Some organisms do not release O2 during photosynthesis.
III:
O2 evolved by the green plant comes from H2O, not from carbon dioxide.
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Introduction | Historical View: Experiments |
78%
From NCERT
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Consider the two statements:
| Statement I: | Chloroplasts align perpendicular to the walls of mesophyll cells when intensity of light is minimum, to get more and more of light. |
| Statement II: | Chloroplasts align parallel to the walls of mesophyll cells when intensity of light is minimum, to get more and more of light. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is incorrect; Statement II is correct |
| 3. | Statement I is correct; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Chloroplast Structure |
61%
From NCERT
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The given diagram shows action spectrum of photosynthesis superimposed on absorption spectrum of chlorophyll a. Identify the correct inference that can be drawn:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | Chlorophyll a is the chief pigment associated with photosynthesis. |
| II: | Most of the photosynthesis takes place in the blue and red regions of the spectrum. |
| III: | No pigments other than chlorophyll a are involved in absorbing sunlight in green plants. |
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Pigments |
85%
From NCERT
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Consider the given two statements:
| Assertion(A): | The whole scheme of transfer of electrons, during light reactions, is called the Z scheme. |
| Reason(R): | Z shape is formed when all the carriers are placed in a sequence on a redox potential scale. |
| 1. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 2. | (A) is true but (R) is false. |
| 3. | Both (A) and (R) are true and (R) correctly explains (A). |
| 4. | (A) is false but (R) is true. |
Subtopic: Light Reaction: Electron Transport |
66%
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Regarding ATP synthesis through chemiosmosis in chloroplasts:
| I: | The protons or hydrogen ions that are produced by the splitting of water accumulate within the lumen of the thylakoids. |
| II: | The primary accepter of electron which is located towards the outer side of the membrane transfers its electron not to an electron carrier but to an H carrier. |
| III: | The NADP reductase enzyme is located on the stroma side of the membrane. |
| 1. | Only I and II are correct |
| 2. | Only I and III are correct |
| 3. | Only II and III are correct |
| 4. | I, II and III are correct |
Subtopic: Chemiosmotic hypothesis |
82%
From NCERT
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The biosynthetic phase of photosynthesis is called as the dark reaction because:
| I. | the biosynthetic process continues for the entire time when the light is unavailable. |
| II. | the biosynthetic process stops when the light becomes available again. |
| 1. | Only I is correct |
| 2. | Both I and II are incorrect |
| 3. | Only II is correct |
| 4. | Both I and II are correct |
Subtopic: Dark Reaction: Biosynthetic Phase |
69%
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Out of the given two statements:
| Statement I: | The Calvin pathway occurs in all photosynthetic plants. |
| Statement II: | All photosynthetic plants have PGA as the first product of CO2 fixation. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is incorrect; Statement II is correct |
| 3. | Statement I is correct; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Dark Reaction : Calvin Cycle |
75%
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The reaction centre in PS II has an absorption maxima at:
| 1. | 780 nm | 2. | 680 nm |
| 3. | 700 nm | 4. | 660 nm |
Subtopic: Light Reactions |
90%
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NEET - 2023
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
How many ATP and NADPH2 are required for the synthesis of one molecule of glucose during Calvin cycle?
| 1. | 18 ATP and 16 NADPH2 |
| 2. | 12 ATP and 12 NADPH2 |
| 3. | 18 ATP and 12 NADPH2 |
| 4. | 12 ATP and 16 NADPH2 |
Subtopic: Dark Reaction : Calvin Cycle |
89%
From NCERT
NEET - 2023
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
Which of the following combinations is required for chemiosmosis?
| 1. | Proton pump, electron gradient, NADP synthase. |
| 2. | Membrane, proton pump, proton gradient, ATP synthase. |
| 3. | Membrane, proton pump, proton gradient, NADP synthase |
| 4. | Proton pump, electron gradient, ATP synthase |
Subtopic: Chemiosmotic hypothesis |
80%
From NCERT
NEET - 2023
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
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