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Q. No.Who predicted that plants give off oxygen as a result of splitting of water molecules during photosynthesis, not of carbon dioxide molecules as thought before?
1.
Preistley
2.
C. B. van Neil
3.
T. W. Engelmann
4.
Arnon and his co-workers
Subtopic: Historical View: Experiments |
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In PS I, the reaction centre chlorophyll a has an absorption peak at:
| 1. | 660 nm | 2. | 680 nm |
| 3. | 700 nm | 4. | 730 nm |
Subtopic: Light Reactions :1 |
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For every CO2 molecule entering the Calvin cycle:
| 1. | 3 molecules of ATP and 3 of NADPH are required. |
| 2. | 3 molecules of ATP and 2 of NADPH are required. |
| 3. | 3 molecules of ATP and 3 of NADPH are required. |
| 4. | 2 molecules of ATP and 2 of NADPH are required |
Subtopic: Dark Reaction : Calvin Cycle |
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Regarding Kranz anatomy, the bundle sheath cells:
| 1. | are rich in an enzyme Ribulose bisphosphate carboxylase-oxygenase (RuBisCO) but lack PEPcase. |
| 2. | are rich in enzymes Ribulose bisphosphate carboxylase-oxygenase (RuBisCO) and PEPcase. |
| 3. | lack enzymes Ribulose bisphosphate carboxylase-oxygenase (RuBisCO) and PEPcase. |
| 4. | lack enzyme Ribulose bisphosphate carboxylase-oxygenase (RuBisCO) but are rich in PEPcase. |
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
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Consider the two statements:
| Statement I: | In C4 plants, photorespiration does not occur. |
| Statement II: | C4 plants have a mechanism that increases the concentration of CO2 at the RuBisCO enzyme site. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is incorrect; Statement II is correct |
| 3. | Statement I is correct; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Photorespiration |
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Consider the two statements:
| Statement I: | Current availability of CO2 levels is limiting to the C3 plants. |
| Statement II: | C3 plants show saturation at about \(360 ~\mu lL^{-1}\) |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is incorrect; Statement II is correct |
| 3. | Statement I is correct; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Factors Affecting Photosynthesis |
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Consider the given two statements:
| Assertion (A): | Photosynthesis cannot be carried out in higher plants at very high temperatures. |
| Reason (R): | Carbon fixation is an enzyme mediated process and the enzymes would be denatured at very high temperatures. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True; (R) is False |
| 3. | (A) is False; (R) is False |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A). |
Subtopic: Factors Affecting Photosynthesis |
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A plant is growing in an open field during a hot summer day. Which of the following limiting factor will have the greatest effect on photosynthesis carried out by this plant?
1. Carbon dioxide concentration
2. Light intensity
3. Temperature
4. Oxygen
1. Carbon dioxide concentration
2. Light intensity
3. Temperature
4. Oxygen
Subtopic: Factors Affecting Photosynthesis |
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What is the site of the light-dependent reactions in photosynthesis in higher plants?
1. Stroma of chloroplasts
2. Thylakoid membrane
3. Lumen of thylakoid
4. Intermembrane space
1. Stroma of chloroplasts
2. Thylakoid membrane
3. Lumen of thylakoid
4. Intermembrane space
Subtopic: Light Reaction: Electron Transport |
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Which wavelength of the visible spectrum of sunlight carries maximum energy?
| 1. | Violet/Blue | 2. | Green |
| 3. | Yellow | 4. | Red |
Subtopic: Pigments |
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