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Q. No.The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because
1.
there is a change in the permeability of the inner mitochondrial membrane toward adenosine diphosphate (ADP)
2.
high energy bonds are formed in mitochondrial proteins
3.
ADP is pumped out of the matrix into the intermembrane space
4.
a proton gradient forms across the inner membrane
Subtopic: Chemiosmotic hypothesis |
83%
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Read the following four statements a, b, c and d and select the right option having both correct statements:
| (a) | Z scheme of light reaction takes place in presence of PS I only |
| (b) | Only PS I is functional in cyclic photophosphorylation |
| (c) | Cyclic photophosphorylation results into synthesis of ATP and NADPH |
| (d) | Stroma lamellae lack PS II as well as NADP reductase |
Options :
| 1. | (c) and (d) |
| 2. | (b) and (d) |
| 3. | (a) and (b) |
| 4. | (b) and (c) |
Subtopic: Light Reaction: Electron Transport | Dark Reaction: Biosynthetic Phase |
82%
From NCERT
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Study the pathway given below. In which of the following options, correct words for all the three blanks a, b and c are indicated?
| (a) | (b) | (c) | |
| 1. | Carboxylation | Decarboxylation | Reduction |
| 2. | Decarboxylation | Reduction | Regeneration |
| 3. | Fixation | Transamination | Regeneration |
| 4. | Fixation | Decarboxylation | Regeneration |
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
72%
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In Kranz anatomy, the bundle sheath cells have
| 1. | thick walls, many intercellular spaces and few chloroplasts |
| 2. | thin walls, many intercellular spaces and no chloroplasts |
| 3. | thick walls, no intercellular spaces and large number of chloroplasts |
| 4. | thin walls, no intercellular spaces and several chloroplasts |
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
86%
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With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?
| 1. | Increasing atmospheric concentration up to 0.05 % can enhance fixation rate |
| 2. | plants respond to higher temperatures with enhanced photosynthesis while plants have much lower temperature optimum |
| 3. | Tomato is a greenhouse crop which can be grown in – enriched atmosphere for higher yield |
| 4. | Light saturation for fixation occurs at 10% of full sunlight |
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
80%
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| Assertion(A): | Not all organisms use carbon dioxide as a source of carbon atoms to carry out photosynthesis. |
| Reason(R): | Photoheterotrophs use organic compounds, rather than carbon dioxide, as a source of carbon. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Historical View: Experiments |
55%
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| Assertion(A): | The Calvin cycle in most plants occurs during daylight. |
| Reason(R): | None of the steps of the Calvin cycle require light directly |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False |
Subtopic: Dark Reaction : Calvin Cycle |
53%
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Given below are two statements:
| Assertion (A): | Action spectrum of photosynthesis is much broader than the absorption spectrum of chlorophyll a. |
| Reason (R): | Accessory pigments with different absorption spectra are also present in chloroplasts. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are false. |
Subtopic: Pigments |
60%
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| Assertion: | Photophosphorylation in chloroplasts and oxidative phosphorylation in mitochondria are different. |
| Reason: | In chloroplasts the high energy electrons come from food while in mitochondria they come from water. |
| 1. | Both assertion and reason are true and the reason is the correct explanation of the assertion. |
| 2. | Both assertion and reason are true but the reason is not the correct explanation of the assertion. |
| 3. | Assertion is true but reason is false. |
| 4. | Both assertion and reason are false |
Subtopic: Light Reaction: Photophosphorylation |
63%
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | The reaction center of PS I is known as P700 and the reaction center of PS II is known as P680. |
| Reason (R): | PS I functions first in the light reactions. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Photosystems | Light Reaction: Electron Transport |
78%
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