Q. No.Energy released by oxidation in respiration:
1. can use only carbohydrates as respiratory substrate
2. is all released free into the cell
3. is all released in a single step
4. cannot be used directly
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Plants can get along without respiratory organs. What may be the reason/s for this?
I. Each plant part takes care of its own gas exchange needs
II. Plants do not present great demands for gas exchange
| 1. Both I and II | 2. Only I |
| 3. Only II | 4. Neither I nor II |
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In Section 12.1, it is written that most cells of a plant have at least a part of their surface in contact with air. The arguments in favor of this statement include all except:
1. Flattened leaves
2. Closely packed parenchyma in most regions
3. Presence of lenticels
4. Mostly dead cells in the interior
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Which of the following exhibits the highest rate of respiration?
| 1. Growing shoot apex | 2. Germinating seed |
| 3. Root tip | 4. Leaf bud |
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| Fermentation | Aerobic respiration | |
| I: | Partial breakdown of glucose | Complete breakdown of glucose |
| II: | Net gain of only two molecules of ATP beginning with one molecule of glucose | Net gain of many more molecules of ATP beginning with one molecule of glucose |
| III: | NADH is oxidised to NAD+ slowly | NADH is oxidised to NAD+ vigorously |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
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| I: | Transport of gases from the respiratory surface to the cells |
| II: | Breakdown of food material within the cell to release energy |
| III: | Trapping of energy released during the breakdown of food material within the cell for synthesis of ATP |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
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Consider the two statements:
| Statement I: | Inside a cell, the glucose molecule is oxidised not in one step but in several small steps. |
| Statement II: | Some steps will be just large enough such that energy liberated can be coupled to ATP synthesis. |
| 1. | Both Statement I and Statement II are correct and Statement II explains Statement I |
| 2. | Both Statement I and Statement II are correct but Statement II does not explain Statement I |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
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The enzymatic machinery to partially oxidize glucose without the help of oxygen is present in:
1. All living organisms
2. All prokaryotes only
3. Prokaryotes and obligate anaerobes only
4. Facultative and obligate anaerobes only
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Sucrose is converted into glucose and fructose by the enzyme:
| 1. Sucrase | 2. Aldolase |
| 3. Invertase | 4. Zymase |
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How many ATP molecules are directly synthesized in glycolytic pathway from one glucose molecule?
| 1. 2 | 2. 4 |
| 3. 6 | 4. 10 |
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