- 1(current)
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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The ‘light reaction’ of photosynthesis in higher plants does not include:
| 1. | Light absorption |
| 2. | Water splitting and oxygen release |
| 3. | Formation of ATP and NADPH |
| 4. | Fixation of carbon |
Subtopic: Dark Reaction: Biosynthetic Phase | Light Reactions |
90%
From NCERT
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The correct statements about photosynthesis include:
| I: | the light-dependent reactions can occur only in the light, the light-independent reactions only in the dark |
| II: | photorespiration is more efficient at producing glucose than is photosynthesis |
| III: | the light-dependent reactions produce the energy-rich compounds that are used to run the light-independent reactions |
| 1. | I only | 2. | III only |
| 3. | I and III only | 4. | II and III only |
Subtopic: Light Reaction: Electron Transport | Dark Reaction: Biosynthetic Phase | Light Reactions |
80%
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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Hints
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Identify the incorrect statement regarding the light independent reactions in photosynthesis:
| 1. | These reactions occur in the stroma. |
| 2. | They use the products (ATP and NADPH) of light-dependent reactions. |
| 3. | They occur in the absence of light and hence are called the dark reactions. |
| 4. | The three phases are carbon fixation, reduction reactions, and ribulose 1,5-bisphosphate (RuBP) regeneration. |
Subtopic: Dark Reaction: Biosynthetic Phase |
81%
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Hints
For the synthesis of glucose, the source of hydrogen atoms is:
| 1. | Water | 2. | NADPH |
| 3. | FADH2 | 4. | Monosaccharides |
Subtopic: Dark Reaction: Biosynthetic Phase |
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Hints
NCERT textbook mentions that “immediately after light becomes unavailable, the biosynthetic process continues for some time and then stops”. Why does it stop after some time?
| 1. | The respiration stops in the absence of light and hence synthesis of sugars stops |
| 2. | The reactions of the biosynthetic phase are directly dependent on light |
| 3. | The reactions of the biosynthetic phase are dependent on the products of light reaction |
| 4. | This is a mistake in NCERT as Dark Reactions will continue throughout night |
Subtopic: Chloroplast Structure | Dark Reaction: Biosynthetic Phase |
89%
From NCERT
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Hints
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- 1(current)
Q. No.
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