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Q. No.In PS I the reaction centre chlorophyll a has an absorption peak at:
1. 400 nm
2. 430 nm
3. 680 nm
4. 700 nm
Subtopic: Light Reaction: Electron Transport |
94%
From NCERT
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The electrons that are moved from photosystem II are replaced by electron from:
1. PS I
2. Water
3. Glucose
4. Acetyl CoA
1. PS I
2. Water
3. Glucose
4. Acetyl CoA
Subtopic: Light Reaction: Electron Transport |
89%
From NCERT
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Consider the two statements:
| Assertion (A): | Cyclic photophosphorylation results only in the synthesis of ATP, but not of NADPH + H+. |
| Reason (R): | Cyclic photophosphorylation occurs only when light of wavelengths beyond 680 nm are available for excitation. |
| 1. | (A) is True but (R) is False |
| 2. | Both (A) and (R) are True and (R) correctly explains (A) |
| 3. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 4. | Both (A) and (R) are False |
Subtopic: Light Reaction: Electron Transport |
From NCERT
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Consider the two statements:
| Assertion(A): | The protons or hydrogen ions that are produced by the splitting of water accumulate within the lumen of the thylakoids. |
| Reason(R): | The primary accepter of electrons, which is located towards the outer side of the membrane, transfers its electron not to an electron carrier but to an H carrier. |
| 1. | (A) is True but (R) is False |
| 2. | Both (A) and (R) are True and (R) explains (A) |
| 3. | Both (A) and (R) are True but (R) does not explain (A) |
| 4. | Both (A) and (R) are False |
Subtopic: Chemiosmotic hypothesis |
62%
From NCERT
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The ATP synthase enzyme consists of two parts where:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | CF0 is embedded in the thylakoid membrane and forms a transmembrane channel that carries out facilitated diffusion of protons across the membrane. |
| II: | CF1 protrudes on the outer surface of the thylakoid membrane on the side that faces the stroma. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Chemiosmotic hypothesis |
94%
From NCERT
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The products of light reaction of photosynthesis include all the following except:
1. ATP
2. NADPH
3. Glucose
4. O2
1. ATP
2. NADPH
3. Glucose
4. O2
Subtopic: WHERE ARE THE ATP AND NADPH USED |
87%
From NCERT
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The radioactive isotope of carbon used by Melvin Calvin to work out the complete biosynthetic pathway in C3 plants was:
1. 11C
2. 12C
3. 13C
4. 14C
1. 11C
2. 12C
3. 13C
4. 14C
Subtopic: WHERE ARE THE ATP AND NADPH USED |
93%
From NCERT
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Consider the two statements:
| Assertion (A): | The primary acceptor of carbon dioxide in C3 plants is a 2-carbon compound. |
| Reason (R): | The first product of carbon dioxide fixation in these plants is a C3 acid. |
| 1. | (A) is True but (R) is False |
| 2. | Both (A) and (R) are True and (R) explains (A) |
| 3. | Both (A) and (R) are True but (R) does not explain (A) |
| 4. | (A) is False but (R) is True |
Subtopic: WHERE ARE THE ATP AND NADPH USED |
87%
From NCERT
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Subtopic: C4 Cycle (Hatch & Slack Pathway) |
90%
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Regarding the temperature optimum for photosynthesis of different plants:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | Tropical plants have a lower temperature optimum than the plants adapted to temperate climates. |
| II: | The C4 plants respond to higher temperatures and show higher rate of photosynthesis while C3 plants have a much lower temperature optimum. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Factors Affecting Photosynthesis |
71%
From NCERT
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