- 1(current)
Q. No.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
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1. Light absorption
2. Water splitting and oxygen release
3. Formation of ATP and NADPH
4. Fixation of carbon
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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 |
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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 |
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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.
For the synthesis of glucose, the source of hydrogen atoms is:
| 1. | Water | 2. | NADPH |
| 3. | FADH2 | 4. | Monosaccharides |
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
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- 1(current)
Q. No.
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