Q. No.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
I: The reduction of oxygen that forms water.
II: Formation of ATP by chemiosmosis
Carbon dioxide splits to form oxygen during:
1. photosynthesis.
2. respiration.
3. photorespiration.
4.None.
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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 |
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. |
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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.
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.
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.
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Identify the correct statement:
| 1. | The light reactions provide ATP and NADPH to the Calvin cycle. |
| 2. | The light reactions provide to the Calvin cycle. |
| 3. | The light reactions supply oxygen to the Calvin cycle. |
| 4. | Calvin cycle is in no way dependent on the light reactions. |
The primary function of the Calvin cycle is to:
1. use ATP to release carbon dioxide
2. use NADPH to release carbon dioxide
3. split water and release oxygen
4. fix inorganic carbon to simple sugars
What is true for both light reactions and the Calvin cycle of photosynthesis in plants?
1. Production of molecular oxygen
2. Depend directly or indirectly on light
3. Requirement of ATP
4. Production of NADPH
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