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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:
Compare this with the correct equation for photosynthesis:
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 |
77%
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
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 |
83%
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Consider the given two statements:
Assertion: The whole scheme of transfer of electrons, during light reactions, is called the Z scheme.
Reason: Z shape is formed when all the carriers are placed in a sequence on a redox potential scale.
1. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
2. Assertion is true but Reason is false.
3. Both Assertion and Reason are true and Reason correctly explains Assertion.
4. Assertion is false but Reason is true.
Assertion: The whole scheme of transfer of electrons, during light reactions, is called the Z scheme.
Reason: Z shape is formed when all the carriers are placed in a sequence on a redox potential scale.
1. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
2. Assertion is true but Reason is false.
3. Both Assertion and Reason are true and Reason correctly explains Assertion.
4. Assertion is false but Reason is true.
Subtopic: Light Reaction: Electron Transport |
65%
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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
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 |
81%
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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
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:
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
| Statement I: | The Calvin pathway occurs in all photosynthetic plants. |
| Statement II: | All photosynthetic plants have PGA as the first product of CO2 fixation. |
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%
From NCERT
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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 |
88%
From NCERT
NEET - 2023
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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 |
87%
From NCERT
NEET - 2023
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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 |
78%
From NCERT
NEET - 2023
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