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 |
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 |
I: | The reaction centre chlorophyll a in PS I is called P700 |
II: | Oxygen evolving complex is associated with PS II |
III. | Both ATP and NADPH are made during cyclic photophosphorylation |
1. | Only I and II are correct |
2. | Only I and III are correct |
3. | Only II and III are correct |
4. | I, II and III are correct |
Feature | C3 Plant | C4 Plant | |
1. | Cell type in which Calvin cycle takes place | Mesophyll cells | Bundle sheath cells |
2. | Cell type in which the initial carboxylation reaction occurs | Bundle sheath cells | Mesophyll cells |
3. | Primary carbon dioxide acceptor | RuBP | PEP |
4. | Number of carbons in the primary carbon dioxide fixation product | 5 | 3 |
In photosynthesis, energy from light reaction to dark reaction is transferred in the form of
1. | ADP | 2. | ATP |
3. | RUDP | 4. | Chlorophyll |
For the synthesis of one glucose molecule, the Calvin cycle operates for:
1. 2 times | 2. 4 times |
3. 6 times | 4. 8 times |
Cyclic photophosphorylation results in the formation of
1. | NADPH | 2. | ATP and NADPH |
3. | ATP, NADPH and O2 | 4. | ATP |
Study the pathway given below-
In which of the following options, correct words for all the three blanks A, B and C are indicated?
A | B | C | |
1. | Fixation | Transamination | Regeneration |
2. | Fixation | Decarboxylation | Regeneration |
3. | Carboxylation | Decarboxylation | Reduction |
4. | Decarboxylation | Reduction | Regeneration |
In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of :
1. | mesophyll | 2. | bundle sheath |
3. | phloem | 4. | epidermis |
A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilization. In which of the following physiological groups would you assign this plant?
1. C4 | 2. CAM |
3. Nitrogen–fixer | 4. C3 |