Q. No.The pH of the space of thylakoid of isolated chloroplast is decreased and then transferred in the dark to a pH-8 solution. The result would most likely be:
I.
The isolated chloroplasts will make ATP.
II.
The Calvin cycle will be activated.
III.
Cyclic photophosphorylation will occur.
1.
Only I
2.
Only I and II
3.
Only I and III
4.
Only II and III
A possible purpose of photorespiration may be:
| 1. | assimilation of nitrate from the soil |
| 2. | translocation of carbohydrates |
| 3. | enhanced PGR efficiency |
| 4. | differentiation of plant cells |
The following diagram shows bundle sheath cells with “special” types of chloroplasts. What is special about them?
| 1. | They are larger than normal size |
| 2. | They are agranal |
| 3. | They are dimorphic |
| 4. | Calvin cycle cannot take place in them |
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. |
Heme and iron-sulfur complexes in photosynthesis:
| 1. | act as reducing agents |
| 2. | act as oxidizing agents |
| 3. | both oxidize and reduce during electron transport |
| 4. | are needed only in respiration but not in photosynthesis |
Both and CAM pathways are regarded as compromises. The reason for this would be:
| 1. | Both pathways lead to reduction of photosynthesis to enable water conservation. |
| 2. | To maintain high photosynthetic levels C4 compromises on water loss and CAM compromises on loss of carbon. |
| 3. | Both minimize photorespiration and optimize the Calvin cycle. |
| 4. | To maintain high photosynthetic levels CAM compromises on water loss and C4 compromises on loss of carbon. |
The number of electrons that need to be transported during cyclic photophosphorylation in sulphur bacteria, to produce one molecule of ATP is:
1. one
2. two
3. three
4. four
The absorption spectrum shown in the given figure can be of:
1. Chlorophyll a
2. Chlorophyll b
3. Carotenoids
4. Either 1 or 2
The enzymes for synthesis of organic molecules, in autotrophic bacteria, are located:
| 1. | on chloroplast membranes |
| 2. | in the cytosol |
| 3. | in the nucleoid region |
| 4. | along the inner surface of the plasma membrane |
Robin Hill discovered that the isolated chloroplasts from plants can release oxygen when they are illuminated by sunlight in the presence of a suitable electron acceptor. This showed:
| I. | oxygen \((O_2)\) is produced by a reaction that is separate from carbon dioxide \((CO_2)\) fixation. |
| II. | the reaction in which oxygen is released requires light. |
| III. | the light dependent reaction of photosynthesis is a result of a series of redox reactions. |
| 1. | I and II only |
| 2. | I and III only |
| 3. | II and III only |
| 4. | I, II and III |
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