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Q. No.The biological processes performed by cyanobacteria in paddy fields include:
I:
biological fixation of CO2.
II:
biological fixation of atmospheric dinitrogen.
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Microbes as Biofertilizer |
From NCERT
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Identify the incorrect statement:
| 1. | The use of the chemical fertilisers has contributed significantly to this pollution. |
| 2. | Biofertilisers are organisms that enrich the nutrient quality of the soil. |
| 3. | The main sources of biofertilisers are bacteria, fungi and cyanobacteria. |
| 4. | Chemical fertilizers are integral and essential component of organic farming. |
Subtopic: Microbes as Biofertilizer |
90%
From NCERT
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Bacillus thuringiensis has been used as:
1. Diazotroph
2. Bioinsecticide
3. Biofertilizer
4. Thrombolytic
1. Diazotroph
2. Bioinsecticide
3. Biofertilizer
4. Thrombolytic
Subtopic: Microbes in Biocontrol Agent |
86%
From NCERT
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The bottled juices are clarified by the use of:
1. lipases and proteases
2. lysozyme and chitinase
3. DNase and protease
4. Pectinases and proteases
1. lipases and proteases
2. lysozyme and chitinase
3. DNase and protease
4. Pectinases and proteases
Subtopic: Chemicals, Enzymes & Other Bioactive Molecules |
91%
From NCERT
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Penicillin was discovered by:
| 1. | Selman Waksman while working on Staphylococci bacteria |
| 2. | Alexander Fleming while working on Staphylococci bacteria |
| 3. | Albert Schatz while working of Streptomyces |
| 4. | François Henri Hallopeau while working of Streptomyces |
Subtopic: Industrial Products, Beverages & Antibiotics |
98%
From NCERT
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Which of the following cheese is ripened with the help of a fungus?
1. Swiss cheese
2. Roquefort cheese
3. Cottage cheese
4. Cream cheese
1. Swiss cheese
2. Roquefort cheese
3. Cottage cheese
4. Cream cheese
Subtopic: Microbes in Household Products |
90%
From NCERT
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Biogas is a mixture predominantly of:
1. Methane and Carbon dioxide
2. Methane and Oxygen
3. Carbon dioxide and Oxygen
4. Hydrogen sulphide and Ammonia
1. Methane and Carbon dioxide
2. Methane and Oxygen
3. Carbon dioxide and Oxygen
4. Hydrogen sulphide and Ammonia
Subtopic: Microbes in Production of Biogas |
96%
From NCERT
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Consider the two statements:
| Assertion (A): | The use of baculovirus as biocontrol agents is especially desirable when an ecologically sensitive area is being treated. |
| Reason (R): | Baculoviruses are species-specific, narrow spectrum insecticides. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True; (R) is False |
| 3. | (A) is False; (R) is False |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A) |
Subtopic: Microbes in Biocontrol Agent |
89%
From NCERT
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Consider the given tow statements:
| Statement I: | BOD is a measure of the organic matter present in the water. |
| Statement II: | BOD refers to the amount of the oxygen that would be consumed if all the organic matter in one litre of water were oxidised by bacteria. |
| 1. | Statement I is correct; Statement II is incorrect |
| 2. | Statement I is incorrect; Statement II is incorrect |
| 3. | Statement I is correct; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: Microbes in Sewage Treatment |
87%
From NCERT
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‘Toddy’, a traditional drink in some parts of southern India, is made by fermenting sap from:
| 1. | Palms | 2. | Soybean |
| 3. | Potato | 4. | Barley |
Subtopic: Microbes in Household Products |
93%
From NCERT
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