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Q. No.Given below are two statements:
Assertion (A):
At any point, the rate of photosynthesis will be determined by the factor available at sub-optimal levels.
Reason (R):
During photosynthesis, usually one factor affecting CO2 fixation is the major cause that limits its rate.
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: Factors Affecting Photosynthesis |
58%
From NCERT
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Given below are two statements:
| Assertion (A): | Light is rarely a limiting factor for plants except for plants in shade. |
| Reason (R): | For photosynthesis, light saturation occurs at 10 percent of full sunlight. |
| 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: Factors Affecting Photosynthesis |
80%
From NCERT
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Given below are two statements:
| Assertion (A): | Water stress can reduce the CO2 availability. |
| Reason (R): | Water stress caused the stomata to close. |
| 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: Factors Affecting Photosynthesis |
77%
From NCERT
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Given below are two statements:
| Assertion (A): | Cyano-bacterial photosynthesis is mostly oxygenic. |
| Reason (R): | NADPH2, ATP and water are used during photosynthesis. |
| 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: Light Reaction: Electron Transport | Dark Reaction: Biosynthetic Phase |
From NCERT
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Given below are two statements:
| Assertion (A): | In green plants, H2O is hydrogen donor and oxidised to O2. |
| Reason (R): | Splitting of water molecules take place on the outer side of the thylakoid membrane. |
| 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: Historical View: Experiments | Chemiosmotic hypothesis |
69%
From NCERT
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Given below are two statements:
| Assertion (A): | Carboxylation is the most crucial step of Calvin cycle. |
| Reason (R): | This reaction is catalysed by the enzyme RuBP carboxylase which results in the formation of two molecules of 3-PGA |
| 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: Dark Reaction : Calvin Cycle |
63%
From NCERT
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Which reagent can be used to determine the essentiality of CO2 for the process of photosynthesis.
1. KOH
2. K2Cr2O7
3. Starch
4. Iodine tincture
1. KOH
2. K2Cr2O7
3. Starch
4. Iodine tincture
Subtopic: Historical View: Experiments |
90%
From NCERT
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Identify the incorrectly matched pair w.r.t. the experimental material used by the scientist.
1. Joseph Priestley - Neem Plant
2. Jan Ingenhousz - Aquatic plant
3. TW Engelmann - Cladophora
4. Cornelius van Niel - Purple & green bacteria
1. Joseph Priestley - Neem Plant
2. Jan Ingenhousz - Aquatic plant
3. TW Engelmann - Cladophora
4. Cornelius van Niel - Purple & green bacteria
Subtopic: Historical View: Experiments |
86%
From NCERT
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Which of the following scientists discovered oxygen?
1. Joseph Priestley
2. Jan Ingenhousez
3. Cornelius van Niel
4. T.W. Engelmann
1. Joseph Priestley
2. Jan Ingenhousez
3. Cornelius van Niel
4. T.W. Engelmann
Subtopic: Historical View: Experiments |
87%
From NCERT
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In the experiment conducted by T.W. Engelmann aerobic bacteria were used.
| 1. | To determine the action spectrum |
| 2. | To determine the absorption spectrum of chlorophyll. |
| 3. | To detect the sites of oxygen (O2) evolution. |
| 4. | To detect the oxidizing species in the photosynthetic reactants. |
Subtopic: Historical View: Experiments |
From NCERT
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