The given diagram shows action spectrum of photosynthesis superimposed on absorption spectrum of chlorophyll a. Identify the correct inference that can be drawn:
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.
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Â Pigments |
 85%
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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. |
Subtopic: Â 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: Â Chemiosmotic hypothesis |
 82%
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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: Â 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: Â 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: Â Light Reactions |
 90%
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: Â Dark Reaction : Calvin Cycle |
 89%
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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: Â Chemiosmotic hypothesis |
 80%
From NCERT
NEET - 2023
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Match List-I with List-II
Choose the correct answer from the options given below:
| List-I | List-II | ||
| (A) | Chlorophyll a | (I) | Yellow to yellow orange |
| (B) | Chlorophyll b | (II) | Yellow green |
| (C) | Xanthophyll | (III) | Blue green |
| (D) | Carotenoids | (IV) | Yellow |
| Options: | (A) | (B) | (C) | (D) |
| 1. | III | II | IV | I |
| 2. | III | I | IV | II |
| 3. | II | III | I | IV |
| 4. | IV | III | II | I |
Subtopic: Â Pigments |
 83%
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NEET - 2023
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Given below are two statements :
In the light of the above statements, choose the most appropriate answer from the options given below:
| Statement I: | RuBisCO is the most abundant enzyme in the world. |
| Statement II: | Photorespiration does not occur in C4 plants. |
| 1. | Statement I is correct but Statement II is incorrect |
| 2. | Statement I is incorrect but Statement II is correct |
| 3. | Both Statement I and Statement II are correct |
| 4. | Both Statement I and Statement II are incorrect |
Subtopic: Â Photorespiration |
 85%
From NCERT
NEET - 2023
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