Q. No.Consider the given two statements:
| I: | Carbon reactions during photosynthesis in higher plants are called as dark reactions. |
| II: | They occur in darkness and they are not light-dependent. |
| 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. | I is incorrect but II is correct |
Subtopic: Dark Reaction: Biosynthetic Phase | Dark Reaction : Calvin Cycle |
81%
From NCERT
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Consider the given two statements:
| Assertion (A): | The term "dark reaction" is considered a misnomer for the Calvin cycle. |
| Reason (R): | These reactions do not require darkness to occur, but rather they do not directly require light. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Dark Reaction : Calvin Cycle |
88%
From NCERT
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The pathway:
| 1. | is common to all plants |
| 2. | takes place in mesophyll cells in C4 plants |
| 3. | takes place in bundle sheath cells in C3 plants |
| 4. | does not take place in CAM plants |
Subtopic: Dark Reaction : Calvin Cycle |
86%
From NCERT
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The reactions of the Calvin cycle can take place as long as which of the following products of the light dependent reactions are available?
| 1. | Water and Glucose |
| 2. | Water and ATP |
| 3. | Oxygen and Carbon dioxide |
| 4. | ATP and NADPH |
Subtopic: Dark Reaction: Biosynthetic Phase | Dark Reaction : Calvin Cycle |
88%
From NCERT
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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 |
69%
From NCERT
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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%
From NCERT
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Which of the following must occur in the biochemical pathway of Calvin cycle?
| 1. | addition of a pair of electrons from NADPH |
| 2. | inactivation of RuBP carboxylase enzyme |
| 3. | regeneration of ATP from ADP |
| 4. | regeneration of RuBP |
Subtopic: Dark Reaction : Calvin Cycle |
79%
From NCERT
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The primary function of the Calvin cycle is to:
| 1. | use ATP to release carbon dioxide |
| 2. | use NADPH to release carbon dioxide |
| 3. | split water and release oxygen |
| 4. | fix inorganic carbon to simple sugars |
Subtopic: Dark Reaction : Calvin Cycle |
82%
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Consider the given two statements:
| Assertion(A): | The enzyme that catalyses carboxylation of RuBP in Calvin cycle would be more correctly called RuBisCO rather than RuBP carboxylase. |
| Reason(R): | This enzyme also has an oxygenation activity apart from a carboxylase activity. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False |
Subtopic: Dark Reaction : Calvin Cycle |
86%
From NCERT
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Rubisco enzyme is involved in two activities, which are:
| 1. | Photolysis of water and carbon fixation |
| 2. | Carbon fixation and oxygenation of RuBP |
| 3. | ATP synthesis and NADPH formation |
| 4. | Oxygen evolution and reduction of carbon dioxide |
Subtopic: Dark Reaction : Calvin Cycle |
89%
From NCERT
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