The first stable product of CO2 fixation in sorghum is:
1. | Succinic acid | 2. | Phosphoglyceric acid |
3. | Pyruvic acid | 4. | Oxaloacetic acid |
Immediately after light becomes unavailable, the biosynthetic phase of photosynthesis continues for some time and then stops. If then, light is made available, the synthesis starts again. A logical conclusion of these observations will include:
I: | Biosynthetic phase does not directly depend on the presence of light. |
II: | Biosynthetic phase depends on the products of light reactions. |
III: | Biosynthesis phase occurs only in the dark or in the absence of light. |
1. | Only I and II | 2. | Only III |
3. | Only II | 4. | I, II and III |
In a photosystem:
1. | The reaction centre is where light is captured, while the antenna complex is where this light energy is transformed into chemical energy. |
2. | The antenna complex is where light is captured, while the reaction centre is where this light energy is transformed into chemical energy. |
3. | The antenna complex is where light energy is captured and transformed into chemical energy. |
4. | The reaction centre is where light energy is captured and transformed into chemical energy. |
Assertion (A): | The reaction centres in both photosystems in plants is the same. |
Reason (R): | The reaction centres of both photosystems are formed by chlorophyll b molecules. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
I: | The water-splitting complex is located on the inner side of the thylakoid membrane |
II: | The NADP reductase enzyme is located on the stromal side of the thylakoid membrane |
1. | Only I is correct |
2. | Only II is correct |
3. | Both I and II are correct |
4. | Both I and II are incorrect |
I: | Calvin cycle takes place in Bundle sheath cells |
II: | Number of carbon atoms in the primary carbon dioxide acceptor is 5 |
III: | Initial carboxylation reaction occurs in mesophyll cells |
IV: | Primary carbon dioxide fixation product is oxaloacetic acid |
1. | Only I, II and III | 2. | Only I, III and IV |
3. | Only II, III and IV | 4. | I, II, III and IV |
1. | Cornelius van Neil | Oxygen evolved comes from water |
2. | T W Engelmann | First absorption spectrum of chlorophyll a |
3. | Joseph Priestley | Plants restore to the air whatever breathing animals remove |
4. | Jan Ingenhousz | Sunlight is essential for photosynthesis |
1. | There is a linear relationship between incident light and carbon dioxide fixation rates at low light intensities. |
2. | Current availability of carbon dioxide levels is limiting to the C4 plants. |
3. | C4 plants respond to higher temperatures and show higher rates of photosynthesis |
4. | Water stress causes the stomata to close, hence reducing the availability of carbon dioxide |
I: | It is the primary source of all food on earth. |
II: | It is responsible for the release of oxygen into the atmosphere by green plants. |
1. | Only I is correct |
2. | Only II is correct |
3. | Both I and II are correct |
4. | Both I and II are incorrect |
1. | Joseph Priestley | 2. | Jan Ingenhousz |
3. | Julius von Sachs | 4. | C. B. Van Neil |