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Q. No.Which of the following statements are correct?
i.
Solution culture/hydroponics contains all essential minerals except one, the usefulness of which is to be determined.
ii.
Na, Si, Co and selenium are beneficial element required by higher plants
iii.
Zn is the activator of nitrogenases while Mo is the activator of alcohol dehydrogenase.
iv.
Zn is needed for auxin synthesis.
1. (i), (ii), (iii)
2. (i), (ii), (iv)
3. (i) and (iv)
4. None of these
Subtopic: Criteria for Essentiality of Elements | Hydroponics & Aeroponics | Mineral Function |
74%
From NCERT
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Which of the following is not caused by deficiency of mineral?
1. Chlorosis
2. Etiolation
3. Shortening of internodes
4. Necrosis
1. Chlorosis
2. Etiolation
3. Shortening of internodes
4. Necrosis
Subtopic: Mineral Deficiency & Toxicity |
From NCERT
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What happened when we inoculated Rhizobium in wheat field?
1. No increase in production (nitrogen content of soil remains same)
2. A lot of increase in production (nitrogen content of soil increases)
3. Fertility of soil decreases
4. Fertility of soil increases
1. No increase in production (nitrogen content of soil remains same)
2. A lot of increase in production (nitrogen content of soil increases)
3. Fertility of soil decreases
4. Fertility of soil increases
Subtopic: Nitrogen Fixation |
From NCERT
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Nitrifying bacteria are able to
1. convert atmospheric nitrogen into soluble forms
2. convert ammonia to nitrate
3. ammonia to nitrogen
4. nitrate to nitrogen
1. convert atmospheric nitrogen into soluble forms
2. convert ammonia to nitrate
3. ammonia to nitrogen
4. nitrate to nitrogen
Subtopic: Nitrogen metabolism |
From NCERT
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Symbiotic Nitrogen fixation is carried out by
1. Bacillus subtilis
2. Rhizobium leguminosarum
3. Azotobacter
4. Xanthomonas citri
1. Bacillus subtilis
2. Rhizobium leguminosarum
3. Azotobacter
4. Xanthomonas citri
Subtopic: Nitrogen Fixation |
53%
From NCERT
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Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
In light of the above statements, choose the correct answer from the options given below
| Assertion A: | Nitrogen‐fixing bacteria of legume root nodules survive in oxygen‐depleted cells |
| Reason R: | Leghaemoglobin completely removes oxygen from nodule cells |
| 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. | A is false but R is true |
Subtopic: Nitrogen Fixation | Nodule formation |
67%
From NCERT
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Subtopic: Classification of Nutrients |
84%
From NCERT
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The first stable product of fixation of atmospheric nitrogen in leguminous plants is:
1. NO2
2. ammonia
3. NO3
4. Glutamate
1. NO2
2. ammonia
3. NO3
4. Glutamate
Subtopic: Nitrogen Fixation |
85%
From NCERT
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Some functions of nutrient element are given below:
The concerned nutrient is
1. Cu
2. Fe
3. Ca
4. Mo
| I. | Important constituent of proteins involved in ETS. |
| II. | Activator of catalase. |
| III. | Important constituent of cytochrome. |
| IV. | Essential for chlorophyll synthesis. |
1. Cu
2. Fe
3. Ca
4. Mo
Subtopic: Mineral Function |
76%
From NCERT
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Subtopic: Classification of Nutrients |
83%
From NCERT
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