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Q. No.Consider the two statements:
I.
A poison that inhibits an enzyme of the Calvin cycle will also inhibit light reactions.
II.
The light reactions require ADP and NADP+ which would not be produced in sufficient quantities if the Calvin cycle stopped.
1.
Both I and II are correct and II explains I
2.
Both I and II are correct but II does not explain I
3.
I is correct but II is incorrect
4.
Both I and II are incorrect
Subtopic: Dark Reaction : Calvin Cycle |
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You add a water-soluble inhibitor of photosynthesis to the roots of a plant. The plant is actively transpiring. You are surprised that photosynthesis is not reduced. This is most likely due to:
| 1. | Xylem vessels being dead at maturity |
| 2. | Inability of roots to take up water-soluble chemical |
| 3. | Endodermis |
| 4. | Transport of the inhibitor by phloem |
Subtopic: Light Reaction: Electron Transport |
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Current availability of carbon dioxide is limiting to C3 plants . This means that:
| 1. | At low light intensity, C3 plants respond to high CO2 concentrations |
| 2. | Growing plants like tomatoes in carbon dioxide-rich environment is unlikely to increase yield |
| 3. | They show saturation in the rates of photosynthesis at carbon dioxide concentration higher than the current level |
| 4. | They have better water use efficiency and thus, adapted to warm tropical climates |
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
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Immediately after light becomes unavailable, the biosynthetic phase of photosynthesis continues for some time and then stops. If then, light is made available, the synthesis starts again. A logical conclusion of these observations will include:
| I: | Biosynthetic phase does not directly depend on the presence of light. |
| II: | Biosynthetic phase depends on the products of light reactions. |
| III: | Biosynthesis phase occurs only in the dark or in the absence of light. |
| 1. | Only I and II | 2. | Only III |
| 3. | Only II | 4. | I, II and III |
Subtopic: Dark Reaction: Biosynthetic Phase |
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Though chlorophyll a is the major pigment responsible for trapping light, other thylakoid pigments called accessory pigments are also involved. The accessory pigments:
| I: | Include xanthophylls and carotenoids but not chlorophyll b |
| II: | Absorb light and transfer electrons to chlorophyll a |
| III: | Enable a wider range of wavelength of incoming light to be reflected by green leaves |
| IV: | Make Chlorophyll a more prone to photo-oxidation |
The incorrect statements include:
| 1. | Only I and II | 2. | Only III and IV |
| 3. | Only I, III and IV | 4. | I, II, III and IV |
Subtopic: Photosynthetic Pigments |
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In a photosystem:
| 1. | The reaction centre is where light is captured, while the antenna complex is where this light energy is transformed into chemical energy. |
| 2. | The antenna complex is where light is captured, while the reaction centre is where this light energy is transformed into chemical energy. |
| 3. | The antenna complex is where light energy is captured and transformed into chemical energy. |
| 4. | The reaction centre is where light energy is captured and transformed into chemical energy. |
Subtopic: Photosystems |
72%
From NCERT
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Consider the given two statements:
| I: | The oxygenation reaction of RuBisCO is a wasteful process. |
| II: | 3-phosphoglycerate is not created. |
| 1. | Both I and II are correct and II explains I |
| 2. | I is correct but II is incorrect |
| 3. | Both I and II are correct but II does not explain I |
| 4. | I is incorrect but II is correct |
Subtopic: Photorespiration |
From NCERT
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Identify the incorrect match:
| C3 plants | C4 plants | ||
| 1. | Primary carbon dioxide acceptor | RuBP | PEP |
| 2. | Primary carbon dioxide fixation product | PGA | OAA |
| 3. | Presence of PEPcase | Yes | Yes |
| 4. | Cell type in which initial carboxylation reaction occurs | Mesophyll | Bundle sheath |
Subtopic: Dark Reaction : Calvin Cycle | C4 Cycle (Hatch & Slack Pathway) |
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Consider the following two statements:
| I. | Plants with C3 pathway have a single type of photosynthetic cell: the mesophyll cell. |
| II. | Their bundle sheath cells do not contain chloroplasts. |
| 1. | Both I and II are correct |
| 2. | Only I is correct |
| 3. | Only II is correct |
| 4. | Both I and II are incorrect |
Subtopic: Dark Reaction : Calvin Cycle |
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Match each item in Column I with the one in Column II regarding C4 plants and select the correct match from the codes given:
Codes:
| Column I | Column II | ||
| A. | Primary acceptor of carbon dioxide | P. | RuBP |
| B. | Cells in which Calvin cycle takes place | Q. | PEP |
| C. | Primary carbon dioxide fixation product | R. | Bundle sheath |
| D. | Example | S. | Mesophyll |
| T. | PGA | ||
| U. | OAA | ||
| V. | Sorghum | ||
| W. | Wheat |
| A | B | C | D | |
| 1. | Q | S | U | V |
| 2. | P | S | T | W |
| 3. | Q | R | U | V |
| 4. | P | R | T | W |
Subtopic: C4 Cycle (Hatch & Slack Pathway) | C4 Plants Examples |
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From NCERT
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