Q. No.The given figure shows a stage in development of root nodule in soyabean. What will be true?
I. A shows an infection thread through which the bacterial cells reach the inner cortex.
II. B shows the division of the cortex and the pericycle cells in the formation of root nodules.
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
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I. Tube in which the plants are grown should be straight and not on an incline as shown in the figure.
II. Roots of the plants are continuously bathed in the aerated nutrient solution as shown in the diagram.
| 1. Only I | 2. Only II |
| 3. Both I and II | 4. Neither I nor II |
| A. Industrial nitrogen fixation B. Electrical nitrogen fixation C. Denitrification D. Ammonification |
 |
| I | II | III | IV | |
| 1. | A | B | C | D |
| 2. | B | A | C | D |
| 3. | A | B | D | C |
| 4. | B | A | D | C |
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Identify the incorrect statement regarding the development of root nodules in soyabean:
1. Rhizobium bacteria contact a susceptible root hair, divide near it
2. Successful infection of the root hair causes it to curl
3. Infected thread carries the bacteria to the inner cortex, the bacteria get modified into rod-shaped bacteroids and cause inner cortical and pericycle cells to divide which leads to nodule formation
4. A mature nodule is complete without any vascular tissues continuous with those of the root.
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| 1. | in the roots of non-leguminous plants like Alnus but unlike Rhizobium does not form any root nodules |
| 2. | in the roots of leguminous plants like Soybean but unlike Rhizobium does not form any root nodules |
| 3. | in the roots of non-leguminous plants like Alnus and like Rhizobium forms root nodules |
| 4. | in the roots of leguminous plants like Soybean and like Rhizobium forms root nodules |
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1. Thiobacillus and Pseudomonas
2. Nitrosomanas and Nitrobacter
3. Rhodospirillum and Azotobacter
4. Beijerinckia and Frankia
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Statement I: Excess of manganese in higher plants may induce deficiency of iron.
Statement II: Manganese inhibits translocation of iron at apex.
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 and Statement II is incorrect
4. Statement I is incorrect and Statement II is correct
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| I: | Deficiency symptoms of nitrogen, potassium and magnesium are visible first in the senescent leaves. |
| II: | These elements are a part of the structural component of the cell and hence are not easily released. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | I is correct and II is incorrect |
| 4. | I is incorrect and II is correct |
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I. Nitrogenase
II. Nitrate reductase
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
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I. is mainly obtained in the form of ferric ions.
II. is reversibly reduced from Fe3+ to Fe2+ during electron transfer.
III. inactivates catalase enzyme.
1. Only I is correct
2. Both I and II are incorrect
3. Only III is incorrect
4. I, II and III are correct
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