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Q. No.A C3 plant was provided carbon dioxide labelled with a radioactive isotope. The amount of radioactivity was measured in chloroplasts. In which of the following molecules do you expect the radioactivity to appear first as the process of photosynthesis proceeds in this plant?
1.
OAA
2.
PEP
3.
PGA
4.
RuBP
Subtopic: Dark Reaction : Calvin Cycle |
70%
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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 |
88%
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Subtopic: C4 Cycle (Hatch & Slack Pathway) | C4 Plants Examples |
83%
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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: C4 Cycle (Hatch & Slack Pathway) | Photorespiration |
77%
From NCERT
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In Hatch and Slack pathway:
| 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. |
| 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 |
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
63%
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: Photorespiration |
81%
From NCERT
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In the photorespiratory pathway:
| 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 |
80%
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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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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: Dark Reaction : Calvin Cycle | C4 Cycle (Hatch & Slack Pathway) |
78%
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 |
78%
From NCERT
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