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Q. No.Assertion (A): Photorespiration decreases the rate of photosynthesis.
Reason (R): RUBISCO can also behave as an oxygenase
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Photorespiration | Factors Affecting Photosynthesis |
53%
From NCERT
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Assertion (A): During photophosphorylation light energy is utilized to produce the proton gradient that is required for ATP synthesis
Reason (R): Oxidative phosphorylation results as the energy of oxidation-reduction is utilized for phosphorylation.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Reason (R): Oxidative phosphorylation results as the energy of oxidation-reduction is utilized for phosphorylation.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Chemiosmotic hypothesis |
62%
From NCERT
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Assertion (A): Chief photosynthetic pigment is chlorophyll a but plants evolved some other pigments also.
Reason (R): Photosynthetic efficiency is increased due to absorptions of variety of wavelengths.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Reason (R): Photosynthetic efficiency is increased due to absorptions of variety of wavelengths.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Pigments |
68%
From NCERT
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Match the name of the scientist in Column I with his contribution in Column II and select the correct match from the codes given:
Codes:
| Column I | Column II | ||
| A. | Julius von Sachs | P. | O2 evolved by the green plant comes from H2O |
| B. | T.W. Engelmann | Q. | Glucose is usually stored as starch by plants |
| C. | Cornelius van Niel | R. | Sunlight is essential for photosynthesis |
| D. | Jan Ingenhousz | S. | First action spectrum of photosynthesis |
| A | B | C | D | |
| 1. | Q | S | P | R |
| 2. | Q | R | P | S |
| 3. | P | Q | R | S |
| 4. | P | S | R | Q |
Subtopic: Historical View: Experiments |
89%
From NCERT
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At low light conditions, which of the following groups of plants responds to high CO2 conditions?
1. C3
2. C4
3. Both C3 and C4
4. Neither C3 nor C4
1. C3
2. C4
3. Both C3 and C4
4. Neither C3 nor C4
Subtopic: Factors Affecting Photosynthesis |
56%
From NCERT
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The water-splitting complex in green plants is associated with:
| 1. | PS I, which itself is physically located on the inner side of the membrane of the thylakoid. |
| 2. | PS I, which itself is physically located on the outer side of the membrane of the thylakoid. |
| 3. | PS II, which itself is physically located on the inner side of the membrane of the thylakoid. |
| 4. | PS II, which itself is physically located on the outer side of the membrane of the thylakoid. |
Subtopic: Light Reaction: Electron Transport |
82%
From NCERT
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The numbers of ATP and NADPH molecules required to make one molecule of glucose through the Calvin pathway, respectively, are:
1. 9 and 6
2. 18 and 12
3. 6 and 9
4. 12 and 18
1. 9 and 6
2. 18 and 12
3. 6 and 9
4. 12 and 18
Subtopic: Dark Reaction : Calvin Cycle |
83%
From NCERT
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The reaction centres in PSI and PSII in higher plants are respectively called as:
1. P680 and P700
2. P700 and P680
3. P870 and P700
4. P680 and P870
1. P680 and P700
2. P700 and P680
3. P870 and P700
4. P680 and P870
Subtopic: Photosystems | Light Reaction: Electron Transport |
93%
From NCERT
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By studying purple sulphur bacteria and green sulphur bacteria, who was the first scientist to demonstrate, in 1931, that photosynthesis is a light-dependent redox reaction in which hydrogen from an oxidizable compound reduces carbon dioxide to cellular materials?
1. Robert Hill
2. C. B. van Neil
3. Arnon
4. Jan Ingenhousz
Subtopic: Historical View: Experiments |
87%
From NCERT
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Consider the given two statements:
| Assertion (A): | C4 plants are more suited to hot climates than C3 plants. |
| Reason(R): | They do not close their stomata in hot, dry weather. |
| 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 and but (R) does not correctly explain (A) |
| 4. | (A) is False but (R) is True |
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
68%
From NCERT
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