Q. No.C. B. van Niel proved that:
1.
Plants produce glucose when they grow.
2.
Blue and red light are effective for photosynthesis.
3.
It is only the green parts of the plants that could release oxygen.
4.
Hydrogen from a suitable oxidizable compound reduces carbon dioxide to carbohydrates.
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When do you think the chloroplasts will be aligned with their flat surfaces parallel to the walls of the mesophyll cells?
1. In dark
2. When light intensity is low
3. When light intensity is high
4. They are always aligned parallel to the walls
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It can be correctly said about the relation between the absorption spectra of various pigments and the action spectrum of photosynthesis that:
| 1. | There is a complete one to one overlap between the absorption spectrum of chlorophyll a and the action spectrum of photosynthesis. |
| 2. | There is a complete one to one overlap between the absorption spectrum of chlorophyll b and the action spectrum of photosynthesis. |
| 3. | The absorption spectrum of chlorophyll a is wider than the action spectrum of photosynthesis. |
| 4. | The absorption spectrum of chlorophyll a is narrower than the action spectrum of photosynthesis. |
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What is true regarding PSI and PSII?
1. PS I works before PS II during the light reaction
2. A single chlorophyll a molecule makes the reaction center in both PS I and PS II
3. The reaction center of PS I is P680 and in PS II is P700
4. LHC is seen in PS I but not in PS II
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The electrons needed to replace those removed from PS I are provided by:
| 1. | The LHC | 2. | Water |
| 3. | NADPH | 4. | PS II |
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Consider the following two statements and choose the correct response from the options given below:
| I: | Protons and oxygen formed by splitting of water are released in the lumen of thylakoid. |
| II: | PS II is physically located on the inner side of the membrane of the thylakoid. |
1. Both I and II are true and II explains I
2. Both I and II are true but II does not explain I
3. I is true and II is false
4. I is false and II is true
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The stroma lamellae membranes:
1. have both PS II and NADP reductase enzyme
2. have PS II but not NADP reductase enzyme
3. lack PS II but have NADP reductase enzyme
4. lack both PS II and NADP reductase enzyme
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The NADP reductase enzyme is located:
| 1. | within the thylakoid membrane |
| 2. | on the stroma side of the thylakoid membrane |
| 3. | on the lumen side of the thylakoid membrane |
| 4. | in the thylakoid lumen |
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The ATP synthase consists of two parts where:
| 1. | is a transmembrane channel and protrudes out towards stroma |
| 2. | is a transmembrane channel and protrudes out towards stroma |
| 3. | is a transmembrane channel and protrudes out towards lumen of thylakoid |
| 4. | is a transmembrane channel and protrudes out towards lumen of thylakoid |
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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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