C4 plants are special. Which of the following will be true for C4 plants?
a.
They have a special type of leaf anatomy
b.
They tolerate higher temperature
c.
They show a response to high light intensities
d.
They lack a process called photorespiration
e.
They have greater productivity of biomass
1.
All except [e]
2.
[b], [c] and [d] only
3.
All
4.
[a], [b], [d] and [e] only
Subtopic: Â C4 Cycle (Hatch & Slack Pathway) |Â Photorespiration |
 78%
From NCERT
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In Hatch and Slack pathway:
1. Only I and II are correct
2. II, III and IV are incorrect
3. Only I, II and III are correct
4. I, II, III and IV are correct
| I: | The C4 acid OAA is formed in the mesophyll cells. |
| II: | Malic acid or aspartic acid are transported to the bundle sheath cells. |
| III: | C4 acids are broken down to release carbon dioxide and a 3 carbon molecule in mesophyll cells. |
| IV: | The 3 carbon molecule is transported back to the bundle sheath cell where it is converted to PEP again. |
2. II, III and IV are incorrect
3. Only I, II and III are correct
4. I, II, III and IV are correct
Subtopic: Â C4 Cycle (Hatch & Slack Pathway) |
 62%
From NCERT
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When the ratio, CO2 : O2 is nearly equal, RuBisCO:
1. has no affinity for oxygen
2. has a much greater affinity for carbon dioxide
3. has a much greater affinity for oxygen
4. has equal affinity for both carbon dioxide and oxygen
1. has no affinity for oxygen
2. has a much greater affinity for carbon dioxide
3. has a much greater affinity for oxygen
4. has equal affinity for both carbon dioxide and oxygen
Subtopic: Â Photorespiration |
 80%
From NCERT
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In the photorespiratory pathway:
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: | there is no synthesis of sugars |
| II: | there is release of carbon dioxide with the utilization of ATP |
| III: | ATP is synthesized but NADPH is not synthesized |
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
Subtopic: Â Photorespiration |
 79%
From NCERT
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Consider the given two statements:
| Statement I: | In C4 plants, photorespiration does not occur. |
| Statement II: | C4 plants do not have RuBisCO in any of their cells. |
| 1. | Both Statement I and Statement II are correct and Statement II explains Statement I |
| 2. | Both Statement I and Statement II are correct but Statement II does not explain Statement I |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: Â C4 Cycle (Hatch & Slack Pathway) |
 86%
From NCERT
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Which of the following is not correctly matched?
| C3 plant | C4 plant | ||
| 1. | Cell type in which Calvin cycle takes place | Mesophyll | Bundle sheath |
| 2. | Primary carbon dioxide acceptor | RuBP | PEP |
| 3. | Primary carbon dioxide fixation product | PGA | OAA |
| 4. | Cell type in which the initial carboxylation reaction occurs | Mesophyll | Bundle sheath |
Subtopic: Â Dark Reaction : Calvin Cycle |Â C4 Cycle (Hatch & Slack Pathway) |
 78%
From NCERT
Please attempt this question first.
Hints
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Consider the given two statements:
| Statement I: | Despite the presence of a green leaf, optimal light and carbon dioxide conditions, the plant may not photosynthesize if the temperature is very low. |
| Statement II: | If a chemical process is affected by more than one factor, then its rate will be determined by the factor which is nearest to its minimal value. |
| 1. | Both Statement I and Statement II are correct and Statement II explains Statement I |
| 2. | Both Statement I and Statement II are correct but Statement II does not explain Statement I |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: Â Factors Affecting Photosynthesis |
 77%
From NCERT
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Consider the given two statements:
| Statement I: | Except for plants in shade or in dense forests, light is rarely a limiting factor in nature. |
| Statement II: | There is a linear relationship between incident light and carbon dioxide fixation rates at low light intensities. |
| 1. | Both Statement I and Statement II are correct and Statement II explains Statement I |
| 2. | Both Statement I and Statement II are correct but Statement II does not explain Statement I |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: Â Factors Affecting Photosynthesis |
 61%
From NCERT
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Consider the given two statements:
| Statement I: | Green house crops such as tomatoes and bell pepper are allowed to grow in carbon dioxide enriched atmosphere. This leads to higher yields. |
| Statement II: | C3 plants respond to higher carbon dioxide concentration by showing increased rates of photosynthesis, leading to higher productivity. |
| 1. | Both Statement I and Statement II are correct and Statement II explains Statement I |
| 2. | Both Statement I and Statement II are correct but Statement II does not explain Statement I |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: Â Factors Affecting Photosynthesis |
 81%
From NCERT
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What percentage in atmosphere of carbon dioxide can become damaging to plants over long periods?
| 1. | 0.03 to 0.04 | 2. | 0.04 to 0.05 |
| 3. | 0.05 | 4. | more than 0.05 |
Subtopic: Â Factors Affecting Photosynthesis |
 77%
From NCERT
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