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Q. No.Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A):
Cyclic photophosphorylation results in the synthesis of ATP but not of NADPH + H+.
Reason (R):
The excited electron does not pass on to NADP+ but is cycled back to the PS I complex through the electron transport chain.
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: Light Reaction: Photophosphorylation |
82%
From NCERT
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Match each item in Column I with the one in Column II regarding C4 plants and select the correct match from the codes given:
Codes:
| Column I | Column II | ||
| A. | Primary acceptor of carbon dioxide | P. | RuBP |
| B. | Cells in which Calvin cycle takes place | Q. | PEP |
| C. | Primary carbon dioxide fixation product | R. | Bundle sheath |
| D. | Example | S. | Mesophyll |
| T. | PGA | ||
| U. | OAA | ||
| V. | Sorghum | ||
| W. | Wheat |
| A | B | C | D | |
| 1. | Q | S | U | V |
| 2. | P | S | T | W |
| 3. | Q | R | U | V |
| 4. | P | R | T | W |
Subtopic: C4 Cycle (Hatch & Slack Pathway) | C4 Plants Examples |
74%
From NCERT
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In the chloroplast:
| Statement I: | The membrane system is the site of enzymatic reactions leading to synthesis of sugar. |
| Statement II: | The stroma is responsible for trapping the light energy and also for the synthesis of ATP and NADPH. |
| 1. | Both Statement I and Statement II are correct |
| 2. | Both Statement I and Statement II are incorrect |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: Chloroplast Structure |
62%
From NCERT
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The ‘light reaction’ of photosynthesis in higher plants does not include:
| 1. | Light absorption |
| 2. | Water splitting and oxygen release |
| 3. | Formation of ATP and NADPH |
| 4. | Fixation of carbon |
Subtopic: Dark Reaction: Biosynthetic Phase | Light Reactions |
90%
From NCERT
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In the Z-scheme, transfer of electrons starts from:
| 1. | the PS II uphill to the acceptor, down the electron transport chain to PS I, transferred to another acceptor after excitation, and finally downhill to NADP+ reducing it to NADPH + H+. |
| 2. | the PS II downhill to the acceptor, down the electron transport chain to PS I, transferred to another acceptor after excitation, and finally uphill to NADP+ reducing it to NADPH + H+. |
| 3. | the PS I uphill to the acceptor, down the electron transport chain to PS II, transferred to another acceptor after excitation, and finally downhill to NADP+ reducing it to NADPH + H+. |
| 4. | the PS I downhill to the acceptor, down the electron transport chain to PS II, transferred to another acceptor after excitation, and finally uphill to NADP+ reducing it to NADPH + H+. |
Subtopic: Light Reaction: Electron Transport |
82%
From NCERT
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The correct chronological stages of the Calvin cycle will be:
| 1. | Carboxylation → Reduction → Regeneration |
| 2. | Carboxylation → Regeneration → Reduction |
| 3. | Regeneration → Reduction → Carboxylation |
| 4. | Reduction → Regeneration → Carboxylation |
Subtopic: Dark Reaction : Calvin Cycle |
95%
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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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. | Fixation | Transamination | Regeneration |
| 2. | Fixation | Decarboxylation | Regeneration |
| 3. | Carboxylation | Decarboxylation | Reduction |
| 4. | Decarboxylation | Reduction | Regeneration |
83%
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Though chlorophyll a is the major pigment responsible for trapping light, other thylakoid pigments called accessory pigments are also involved. The accessory pigments:
| I: | Include xanthophylls and carotenoids but not chlorophyll b |
| II: | Absorb light and transfer electrons to chlorophyll a |
| III: | Enable a wider range of wavelength of incoming light to be reflected by green leaves |
| IV: | Make Chlorophyll a more prone to photo-oxidation |
The incorrect statements include:
| 1. | Only I and II | 2. | Only III and IV |
| 3. | Only I, III and IV | 4. | I, II, III and IV |
Subtopic: Photosynthetic Pigments |
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Membranous system consisting of grana in the chloroplast:
| I: | is responsible for trapping the light energy. |
| II: | is responsible for the synthesis of ATP and NADPH. |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
Subtopic: Chloroplast Structure |
89%
From NCERT
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