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Q. No.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%
From NCERT
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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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Consider the two statements:
Assertion: The light-independent reactions do not require light, but they are most likely to occur during the day.
Reason: NADPH and ATP from the light-dependent reactions are used in the light-independent reactions.
1. Assertion is true but Reason is false
2. Both Assertion and Reason are true and Reason explains Assertion
3. Both Assertion and Reason are true but Reason does not explain Assertion
4. Assertion is false but Reason is true
Assertion: The light-independent reactions do not require light, but they are most likely to occur during the day.
Reason: NADPH and ATP from the light-dependent reactions are used in the light-independent reactions.
1. Assertion is true but Reason is false
2. Both Assertion and Reason are true and Reason explains Assertion
3. Both Assertion and Reason are true but Reason does not explain Assertion
4. Assertion is false but Reason is true
Subtopic: WHERE ARE THE ATP AND NADPH USED |
65%
From NCERT
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In the ‘Regeneration’ stage of the Calvin cycle:
| 1. | Five G3P molecules produce three RuBP molecules, using up three molecules of ATP. |
| 2. | Three G3P molecules produce five RuBP molecules, using up three molecules of ATP. |
| 3. | Three G3P molecules produce five RuBP molecules, using up five molecules of ATP. |
| 4. | Five G3P molecules produce three RuBP molecules, using up five molecules of ATP. |
Subtopic: Dark Reaction : Calvin Cycle |
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