Consider the given two statements:
Statement I:
Except for plants in shade or in dense forests, light is rarely a limiting factor in nature.
Statement II:
There is a linear relationship between incident light and carbon dioxide fixation rates at low light intensities.
1.
Both Statement I and Statement II are correct and Statement II explains Statement I
2.
Both Statement I and Statement II are correct but Statement II does not explain Statement I
3.
Statement I is correct but Statement II is incorrect
4.
Statement I is incorrect but Statement II is correct
Subtopic: Factors Affecting Photosynthesis |
61%
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Consider the given two statements:
| Statement I: | Green house crops such as tomatoes and bell pepper are allowed to grow in carbon dioxide enriched atmosphere. This leads to higher yields. |
| Statement II: | C3 plants respond to higher carbon dioxide concentration by showing increased rates of photosynthesis, leading to higher productivity. |
| 1. | Both Statement I and Statement II are correct and Statement II explains Statement I |
| 2. | Both Statement I and Statement II are correct but Statement II does not explain Statement I |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: Factors Affecting Photosynthesis |
81%
From NCERT
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What percentage in atmosphere of carbon dioxide can become damaging to plants over long periods?
| 1. | 0.03 to 0.04 | 2. | 0.04 to 0.05 |
| 3. | 0.05 | 4. | more than 0.05 |
Subtopic: Factors Affecting Photosynthesis |
77%
From NCERT
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Water affects the process of photosynthesis in higher plants because:
| I: | Water stress can cause the stomata to close, hence, reducing the carbon dioxide availability. |
| II: | Water stress also makes leaves wilt, thus, reducing the surface area of the leaves and their metabolic activity as well. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Factors Affecting Photosynthesis |
93%
From NCERT
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When one CO2 molecule is fixed as one molecule of triose phosphate, which of the following photochemically made, high energy chemical intermediates are used in the reduction phase?
1. 1 ATP + 1 NADPH
2. 1 ATP + 2 NADPH
3. 2 ATP + 1 NADPH
4. 2 ATP + 2 NADPH
1. 1 ATP + 1 NADPH
2. 1 ATP + 2 NADPH
3. 2 ATP + 1 NADPH
4. 2 ATP + 2 NADPH
Subtopic: Dark Reaction : Calvin Cycle |
From NCERT
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Identify the correct statements regarding chemiosmotic hypothesis:
Choose the correct answer from the options given below:
| (a) | Splitting of the water molecule takes place on the inner side of the membrane. |
| (b) | Protons accumulate within the lumen of the thylakoids. |
| (c). | The primary acceptor of electrons transfers the electrons to an electron carrier. |
| (d) | NADP reductase enzyme is located on the stroma side of the membrane. |
| (e) | Protons increase in number in stroma. |
Choose the correct answer from the options given below:
| 1. | (a), (b) and (e) | 2. | (a), (b) and (d) |
| 3. | (b), (c) and (d) | 4. | (b), (c) and (e) |
Subtopic: Chemiosmotic hypothesis |
75%
From NCERT
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Joseph Priestley (1733-1804) in 1770 performed a series of experiments that revealed the essential role of air in the growth of green plants. Priestley observed that a candle burning in a closed space – a bell jar, soon gets extinguished (Figure a, b, c, d). Similarly, a mouse would soon suffocate in a closed space. He concluded that a burning candle or an animal that breathe the air, both somehow, damage the air. But when he placed a mint plant in the same bell jar, he found that the mouse stayed alive and the candle continued to burn.
The conclusions that can be drawn from these experiments will be:
The conclusions that can be drawn from these experiments will be:
| I: | Plants restore to the air whatever breathing animals and burning candles remove. |
| II: | Sunlight is essential to the plant process that somehow purifies the air fouled by burning candles or breathing animals. |
| 1. Only I | 2. Only II |
| 3. Both I and II | 4. Neither I nor II |
Subtopic: Historical View: Experiments |
67%
From NCERT
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What would be true for the sequence of events shown in the given diagram:
| I: | The whole scheme of transfer of electrons, starting from the PS II, uphill to the acceptor, down the electron transport chain to PS I, excitation of electrons, transfer to another acceptor, and finally down-hill to NADP+ reducing it to NADPH + H+ is called the Z scheme. |
| II: | The electrons that are moved from photosystem II get replaced by electrons available due to splitting of water. |
| 1. Only I | 2. Only II |
| 3. Both I and II | 4. Neither I nor II |
Subtopic: Photosystems | Light Reaction: Electron Transport |
89%
From NCERT
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What would be true for the events shown in the given diagram?
| I: | A possible location where this could be happening is in the stroma lamellae. |
| II: | While the membrane or lamellae of the grana have both PS I and PS II, the stroma lamellae membranes lack PS II as well as NADP reductase enzyme. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Light Reaction: Photophosphorylation |
85%
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Identify A, B, C and D:
| Characteristics | C3 Plants | C4 Plants |
| Cell type in which the Calvin cycle takes place | A | B |
| Cell type in which the initial carboxylation reaction occurs | C | D |
| A | B | C | D | |
| 1. | Mesophyll | Bundle sheath | Mesophyll | Bundle sheath |
| 2. | Bundle sheath | Bundle sheath | Mesophyll | Mesophyll |
| 3. | Bundle sheath | Mesophyll | Mesophyll | Mesophyll |
| 4. | Mesophyll | Bundle sheath | Mesophyll | Mesophyll |
Subtopic: Dark Reaction : Calvin Cycle | C4 Cycle (Hatch & Slack Pathway) |
68%
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