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 14.1, 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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