Consider the two statements:
Assertion (A):
Except for plants in shade or in dense forests, light is rarely a limiting factor for photosynthesis in nature.
Reason (R):
Increase in incident light beyond a point causes the breakdown of chlorophyll and a decrease in photosynthesis.
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: Factors Affecting Photosynthesis |
71%
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Consider the two statements:
| Assertion (A): | Current availability of CO2 levels is limiting to the C3 plants. |
| Reason (R): | Carbon dioxide is the major limiting factor for photosynthesis. |
| 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: Factors Affecting Photosynthesis |
56%
From NCERT
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‘The effect of water as a factor affecting photosynthesis is more through its effect on the plant, rather than directly on photosynthesis’. Which of the following support this statement?
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I: | Water stress causes the stomata to close, hence reducing the CO2 availability. |
| II: | Water stress also makes leaves wilt, thus, increasing the surface area of the leaves and their metabolic activity as well. |
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Factors Affecting Photosynthesis |
71%
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Consider the given two statements:
| Assertion (A): | Plants that do not use PEP-carboxylase in carbon fixation are called C3 plants. |
| Reason (R): | The primary carboxylation reaction in C3 plants, catalyzed by RuBisCO, produces the three-carbon 3-phosphoglyceric acids directly in the Calvin-Benson cycle. |
| 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: Dark Reaction : Calvin Cycle | C4 Cycle (Hatch & Slack Pathway) |
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Subtopic: C4 Cycle (Hatch & Slack Pathway) |
63%
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Identify the correct statements:
| I: | Only green plants can prepare their own food. |
| II: | In green plants, all cells, tissues and organs photosynthesise. |
| 1. | Only I |
| 2. | Only II |
| 3. | Both I and II |
| 4. | Neither I nor II |
Subtopic: Introduction | Historical View: Experiments | Pigments |
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Photorespiration
Choose the correct answer from the options given below:
1. A and C only
2. C and D only
3. B and C only
4. A and B only
| A. | In C‐3 plants some Oxygen binds to RuBisCO |
| B. | A specialized kind of leaf anatomy (Kranz Anatomy) is seen in plants exhibiting Photorespiration |
| C. | Involves the activities of chloroplast, mitochondria and peroxisomes |
| D. | It was traced by the work of Calvin and his co‐workers |
1. A and C only
2. C and D only
3. B and C only
4. A and B only
Subtopic: Photorespiration |
70%
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Match List I with List II
Choose the correct answer from the options given below:
1. A ‐ IV , B ‐ III , C ‐ II , D ‐ I
2. A ‐ III , B ‐ II , C ‐ I , D ‐ IV
3. A ‐ IV, B ‐ III , C ‐ I , D ‐ II
4. A ‐ IV , B ‐ II , C ‐ I , D ‐ III
| List I Enzyme |
List II | ||
| A. | RuBISco | I. | Reduces molecular oxygen to form water |
| B. | PEPCase | II. | Catalyzes the phosphorylation of glucose |
| C. | Cytochrome C oxidase | III. | beta‐carboxylation of phosphoenolpyruvate |
| D. | Hexokinase | IV. | Captures atmospheric CO2 |
1. A ‐ IV , B ‐ III , C ‐ II , D ‐ I
2. A ‐ III , B ‐ II , C ‐ I , D ‐ IV
3. A ‐ IV, B ‐ III , C ‐ I , D ‐ II
4. A ‐ IV , B ‐ II , C ‐ I , D ‐ III
Subtopic: Dark Reaction : Calvin Cycle | C4 Cycle (Hatch & Slack Pathway) | C4 Plants Examples |
58%
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RuBisCO:
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
| I: | is the most abundant enzyme in the world |
| II: | is characterised by the fact that its active site can bind to both CO2 and O2 |
| III: | has a much greater affinity for CO2 when the CO2: O2 is nearly equal |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Photorespiration |
88%
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The source of O2 released during photosynthesis is:
1. carbon dioxide
2. water
3. glucose
4. chlorophyll
1. carbon dioxide
2. water
3. glucose
4. chlorophyll
Subtopic: Light Reaction: Electron Transport |
94%
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