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Q. No.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: Factors Affecting Photosynthesis |
76%
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In photosynthesis, energy from light reaction to dark reaction is transferred in the form of
| 1. | ADP | 2. | ATP |
| 3. | RUDP | 4. | Chlorophyll |
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In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of :
| 1. | mesophyll | 2. | bundle sheath |
| 3. | phloem | 4. | epidermis |
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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: Factors Affecting Photosynthesis |
81%
From NCERT
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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: Factors Affecting Photosynthesis |
76%
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: C4 Cycle (Hatch & Slack Pathway) |
86%
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: Photorespiration |
79%
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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: 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: C4 Cycle (Hatch & Slack Pathway) |
63%
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RuBP is:
| 1. | 2 carbon ketose sugar | 2. | 2 carbon aldose sugar |
| 3. | 5 carbon ketose sugar | 4. | 5 carbon aldose sugar |
Subtopic: Dark Reaction : Calvin Cycle |
87%
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