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Q. No.A first action spectrum of photosynthesis was described by:
1. Jan Ingenhousz
2. T.W. Engelmann
3. Julius von Sachs
4. Joseph Priestley
1. Jan Ingenhousz
2. T.W. Engelmann
3. Julius von Sachs
4. Joseph Priestley
Subtopic: Historical View: Experiments |
88%
Level 1: 80%+
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There is a clear division of labour within the chloroplast where:
1. Only A is correct
2. Only B is correct
3. Both A and B are correct
4. Both A and B are incorrect
| A: | The membrane system is the site for enzymatic reactions that synthesise sugar, which in turn forms starch. |
| B: | Stroma is responsible for trapping the light energy and also for the synthesis of ATP and NADPH. |
1. Only A is correct
2. Only B is correct
3. Both A and B are correct
4. Both A and B are incorrect
Subtopic: Light Reactions |
55%
Level 3: 35%-60%
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Thylakoid pigments like chlorophyll b, xanthophylls and carotenoids, which are called accessory pigments:
1. Only A is correct
2. Only B is correct
3. Both A and B are correct
4. Both A and B are incorrect
| A: | enable a wider range of wavelengths of incoming light to be utilised for photosynthesis. |
| B: | protect chlorophyll a from photo-oxidation. |
1. Only A is correct
2. Only B is correct
3. Both A and B are correct
4. Both A and B are incorrect
Subtopic: Photosynthetic Pigments |
97%
Level 1: 80%+
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Identify the correct statements:
1. Only A and B
2. Only A and C
3. Only B and D
4. Only C and D
| A: | Light reactions [‘Photochemical’ phase] include light absorption, water splitting, oxygen release, and the formation of high-energy chemical intermediates, ATP and NADPH. |
| B: | The photosynthetic pigments are organised into two discrete photochemical light harvesting complexes (LHC) within the Photosystem I (PS I) and Photosystem II (PS II). |
| C: | Each photosystem has only chlorophyll a forming a light harvesting system also called antennae. |
| D: | In PS II the reaction centre chlorophyll a has an absorption peak at 700 nm, and is called P700. |
1. Only A and B
2. Only A and C
3. Only B and D
4. Only C and D
Subtopic: Miscellaneous |
68%
Level 2: 60%+
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Consider the two statements:
| Assertion (A): | The protons and oxygen formed by the splitting of water during oxygenic photosynthesis is higher plants are released in the lumen of the thylakoid. |
| Reason (R): | The water splitting complex is associated with the PS II, which itself is physically located on the inner side of the membrane of the thylakoid. |
| 1. | Both (A) and (R) are True and (R) explains (A) |
| 2. | Both (A) and (R) are True, but (R) does not explain (A) |
| 3. | (A) is True but (R) is False |
| 4. | (A) is False but (R) is True |
Subtopic: Light Reactions |
70%
Level 2: 60%+
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Identify the correctly matched pairs:
1. Only A
2. Only A and B
3. Only B and C
4. A, B and C
| Step of Calvin Cycle | Feature | |
| A. | Carboxylation | Catalysed by the enzyme RuBP carboxylase which results in the formation of two molecules of 3-PGA. |
| B. | Reduction | Utilisation of two molecules of ATP for phosphorylation and one of NADPH for reduction per CO2 molecule fixed |
| C. | Regeneration | Requires two ATP for phosphorylation to form RuBP per CO2 molecule fixed |
2. Only A and B
3. Only B and C
4. A, B and C
Subtopic: Dark Reaction : Calvin Cycle |
Level 3: 35%-60%
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The basic pathway that results in the formation of the sugars in photosynthesis, the Calvin pathway:
1. Only A is correct
2. Only B and C are correct
3. A, B and C are correct
4. A, B and C are incorrect
| A: | is common to the C3 and C4 plants. |
| B: | occurs in all the mesophyll cells of the C3 plants. |
| C: | takes place only in the bundle sheath cells in C4 plants. |
1. Only A is correct
2. Only B and C are correct
3. A, B and C are correct
4. A, B and C are incorrect
Subtopic: Dark Reaction : Calvin Cycle |
62%
Level 2: 60%+
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Hints
Consider the two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | In C4 plants photorespiration does not occur. |
| Statement II: | In C4 plants, RuBisCO functions as a carboxylase and lacks the oxygenase activity. |
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Subtopic: C4 and C3 plants |
Level 3: 35%-60%
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Hints
Identify the incorrect statement:
| 1. | Except for plants in shade or in dense forests, light is rarely a limiting factor in nature for photosynthesis in higher plants. |
| 2. | At low light conditions only C3 plants respond to high CO2 conditions. |
| 3. | Tropical plants have a higher temperature optimum for photosynthesis than the plants adapted to temperate climates. |
| 4. | The effect of water as a factor is more through its effect on the plant, rather than directly on photosynthesis. |
Subtopic: Factors Affecting Photosynthesis |
77%
Level 2: 60%+
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Hints
Which of following statements regarding photosynthesis will be true?
1. Only A, B and C
2. Only A, C and D
3. Only B, C, and D
4. A, B, C and D
| A: | In photosynthetic bacteria, the proteins that gather light for photosynthesis are embedded in cell membranes. |
| B: | Chloroplasts may be photosynthetic bacteria that adapted to life inside plant cells. |
| C: | In the reaction: 2 H2O + 2 A + (light, chloroplasts) → 2 AH2 + O2 ; A is the electron acceptor. |
| D: | Phosphoglycolate produced during photorespiration cannot be metabolized by the CalvinBenson cycle and represents carbon lost from the cycle. |
1. Only A, B and C
2. Only A, C and D
3. Only B, C, and D
4. A, B, C and D
Subtopic: Miscellaneous |
Level 3: 35%-60%
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