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Q. No.The following diagram shows the photosynthetic carbon cycle. A and B can respectively be:
1.
Pyruvate; malate or aspartate
2.
Phoshoglycerate; fumarate or aspartate
3.
Phosphoenol pyruvate; malate or aspartate
4.
Phosphoenol pyruvate; fumarate or aspartate
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
89%
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The relationship between photosynthesis and respiration can be best described as:
| 1. | Photosynthesis and respiration are reversal of each other in biochemical pathways. |
| 2. | Photosynthesis stores energy in complex organic molecules, while respiration releases it. |
| 3. | Respiration occurs only in animals and photosynthesis occurs only in plants. |
| 4. | Respiration results in formation of ATP but photosynthesis can only use them. |
Subtopic: Introduction |
69%
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Identify the incorrect statement regarding the enzyme PEP carboxylase:
| 1. | PEP carboxylase has a lower Km for bicarbonate ions, hence, higher affinity — than RuBisCO. |
| 2. | O2 is a very poor substrate for this enzyme. |
| 3. | It plays an important role in C4 cycle but not in CAM plants. |
| 4. | PEP carboxylase is also significant in non-photosynthetic metabolic pathways. |
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
55%
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What can occur during both photosynthesis and respiration?
I: The reduction of oxygen that forms water.
II: Formation of ATP by chemiosmosis
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | None |
Subtopic: Chemiosmotic hypothesis |
59%
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Carbon dioxide splits to form oxygen during:
1. photosynthesis.
2. respiration.
3. photorespiration.
4.None.
Subtopic: Light Reaction: Electron Transport | Light Reactions |
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Identify the correct statements regarding factors affecting photosynthesis:
| I: | At very high light intensities chlorophyll damage can occur due to photo-oxidation. |
| II: | Affinity for carbon dioxide of the enzyme RuBisCO is reduced at higher temperatures. |
| III: | The current availability of carbon dioxide may be a limiting factor for C3 plants. |
| IV: | If leaf undergoes senescence, loss of chlorophyll occurs. |
| 1. | I, II and III only | 2. | I, II and IV only |
| 3. | II, II and IV only | 4. | I, II, III and IV |
Subtopic: Factors Affecting Photosynthesis |
66%
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Probably the strongest biological oxidizing agent is P680+ because:
| 1. | It accepts electron in both photosystems. |
| 2. | It transfers electrons to plastoquinone. |
| 3. | It strongly attracts electrons formed by the splitting of water. |
| 4. | It transfers electrons to plastocyanin. |
Subtopic: Light Reaction: Electron Transport |
73%
From NCERT
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What conclusion can be drawn from the finding that while some bacteria have only photosystem I, cyanobacteria have both?
| 1. | Photosystem II was lost in some species as it was selected against by the nature. |
| 2. | Photosystem I must be more ancestral. |
| 3. | Photosystem II may have evolved to be more photoprotective. |
| 4. | Cyclic photphosprolylation is more important than non cyclic photophosphorylation. |
Subtopic: Photosystems |
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The functions of carotenoids similar to their function in humans would be:
| 1. | Accessory pigments to harvest light energy. |
| 2. | Dissipation of excessive light energy. |
| 3. | Antibacterial in nature. |
| 4. | Removal of toxins from water. |
Subtopic: Pigments |
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In chloroplasts the part of the ATP synthase is located:
| 1. | on the side facing the thylakoid space. |
| 2. | on the ATP molecules themselves. |
| 3. | on the pigment molecules of PS I and PS II. |
| 4. | on the stroma side of the membrane. |
Subtopic: Chemiosmotic hypothesis |
75%
From NCERT
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