Q. No.Identify the correct statement regarding the functioning of photosystem II?
1.
The reaction center is P700.
2.
It works after PS I in non cyclic photophosphorylation.
3.
Water splits and carbon dioxide is released.
4.
The electron vacancies in P680 are filled by electrons derived from water.
Consider the following two statements regarding RuBisCO:
| I: | When carbon dioxide is the substrate, the product of the carboxylase reaction is finally two molecules of glycerate-3-phosphate. |
| II: | When molecular oxygen is the substrate, the products of the oxygenase reaction are two molecules of phosphoglycolate. |
| 1. | Only I is correct | 2. | Only II is correct |
| 3. | Both I and II are correct | 4. | Both I and II are incorrect |
Photosystem I is directly associated with:
1. passing electrons to plastoquinone
2. receiving electrons from plastocyanin
3. P680 as the chlorophyll a reaction-center
4. removal of electrons and protons from water
Identify the correct statements regarding RuBisCO:
| I: | It catalyzes the carboxylation of \(CO_2\) to ribulose 1,5-bisphosphate. |
| II: | It initiates photorespiration when the \(CO_2/O_2\) ratio is low. |
| III: | It catalyzes the reduction of two molecules of PGAL to form glucose. |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
The products of non-cyclic photophosphorylation include:
| 1. | ATP and P700 | 2. | ATP and NADPH |
| 3. | ADP and NADP | 4. | P700 and P680 |
The and photosynthesis pathways are so called because the initial carbon fixation product in them are respectively:
| 1. | pyruvate; malate |
| 2. | malate; pyruvate |
| 3. | 3-phosphoglycerate; oxaloacetic acid |
| 4. | glyceraldehyde 3-phosphate; phospho-enol-pyruvate (PEP) |
The extra ATP required [as compared to NADPH] in Calvin cycle comes from:
| 1. | photosystem II | 2. | photosystem I |
| 3. | cyclic electron flow | 4. | non cyclic electron flow |
In the given simplified diagram of the Calvin Cycle,
ATP is utilized at points:
1. A and B only
2. A and C only
3. B and C only
4. A, B and C
Light dependent reactions are so called because they require light:
| 1. | to provide electrons for the process |
| 2. | to split the water molecule |
| 3. | to impart energy to the electrons in the reaction center |
| 4. | to hydrolyse ATP molecules |
The chronological order of organelles involved in the photorespiration cycle is:
| 1. | chloroplasts, leaf peroxisomes and mitochondria |
| 2. | chloroplasts, mitochondria and leaf peroxisomes |
| 3. | mitochondria, chloroplasts, and leaf peroxisomes |
| 4. | mitochondria, leaf peroxisomes and chloroplasts |
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