Q. No.In photosystem-I, the first electron acceptor is :
(1) ferredoxin
(2) cytochrome
(3) plastocyanin
(4) an iron-sulphur protein
During photorespiration, the oxygen consuming reaction(s) occur in :
(1) stroma of chloroplasts and mitochondria
(2) stroma of chloroplasts and peroxisomes
(3) grana of chloroplasts and peroxisomes
(4) stroma of chloroplasts
Photorespiration is favoured by
| 1. | high O2 and low CO2 concentration |
| 2. | low O2 and high CO2 concentration |
| 3. | low light intensity |
| 4. | low temperature. |
The C4 plants grow very efficiently in warm climates because they
| 1. | consume fewer ATP molecules for glucose synthesis |
| 2. | minimize photorespiratory losses |
| 3. | have more efficient chloroplasts |
| 4. | contain enzymes which are not inactivated at high temperatures. |
Following is needed in the ionic form during non-cyclic photophosphorylation but not during cyclic photophosphorylations in higher plants.
(1) copper
(2) iron
(3) manganese
(4) zinc
Production of NADPH in a chloroplast takes place during
1. cyclic photophosphorylation
2. non-cyclic photophosphorylation
3. series photophosphorylation
4. substrate level photophosphorylation.
The photoautotrophic organisms that do not split water to obtain reducing power are
| 1. | purple bacteria |
| 2. | cyanobacteria |
| 3. | green plants |
| 4. | none of these |
Dark reaction occurs
| 1. | only in light |
| 2. | only in the absence of light |
| 3. | independent of light |
| 4. | both (1) and (3). |
Photorespiration, usually occurs in
(1) one cell organelle
(2) two cell organelles
(3) three cell organelles
(4) four cell organelles.
Which of the following statements about phytochrome is true?
| 1. | Pr absorbs yellow light and becomes Pfr |
| 2. | Pr absorbs red light and becomes Pfr |
| 3. | Pfr absorbs red light and becomes Pr |
| 4. | Pfr absorbs yellow light and becomes Pr . |
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