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 |
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 |
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 |
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 |