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Q. No.In the secondary treatment or biological treatment of sewage water, the primary effluent is passed into large aeration tanks where it is constantly agitated mechanically and the air is pumped into it. This allows:
1. vigorous growth of useful aerobic microbes into flocs
2. the decrease in the number of aerobes in the water
3. rapid increase in the count of methanogens
4. a dramatic decrease in the anaerobic methanogens
1. vigorous growth of useful aerobic microbes into flocs
2. the decrease in the number of aerobes in the water
3. rapid increase in the count of methanogens
4. a dramatic decrease in the anaerobic methanogens
Subtopic: Microbes in Sewage Treatment |
91%
From NCERT
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Aspergillus niger is used in the commercial production of:
| 1. | Citric acid | 2. | Acetic acid |
| 3. | Lactic acid | 4. | Butyric acid |
Subtopic: Chemicals, Enzymes & Other Bioactive Molecules |
89%
From NCERT
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Subtopic: Microbes in Production of Biogas |
88%
From NCERT
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Consider the given two statements:
| I: | Cyclosporin is used to treat and prevent graft-versus-host disease in bone marrow transplantation and to prevent rejection of kidney, heart, and liver transplants. |
| II: | It selectively inhibits the functions of B lymphocytes acting as an immunosuppressant. |
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. Both I and II are incorrect.
Subtopic: Chemicals, Enzymes & Other Bioactive Molecules |
From NCERT
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A therapeutic product that is used to prevent the risk of coronary artery disease by its effect on one of the risk factors is obtained from the microbe:
1. Trichoderma polysporum
2. Streptococcus pyogenes
3. Pseudomonas putida
4. Monascus purpureus
1. Trichoderma polysporum
2. Streptococcus pyogenes
3. Pseudomonas putida
4. Monascus purpureus
Subtopic: Industrial Products, Beverages & Antibiotics |
From NCERT
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During secondary treatment of sewage water:
| I: | vigorous growth of useful aerobic microbes into flocs is allowed |
| II: | aerobic microbes consume the major part of the organic matter in the effluent. |
| III: | the BOD of the water sample gets significantly increased |
| 1. | Only I and II are correct |
| 2. | Only I is correct |
| 3. | Only II and III are correct |
| 4. | I, II and III are correct |
Subtopic: Microbes in Sewage Treatment |
70%
From NCERT
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Consider the given statements regarding antibiotics:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | An antibiotic is a type of antimicrobial substance active against bacteria. |
| II: | Antibiotics may either kill or inhibit the growth of bacteria. |
| III: | Antibiotics are highly effective against viruses such as the common cold or influenza. |
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Industrial Products, Beverages & Antibiotics |
73%
From NCERT
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When lactic acid bacteria (LAB) is used for converting milk to curd, it improves the nutritional quality of curd by increasing:
1. Iron content of the curd
2. Vitamin B12 content of the curd
3. Vitamin D content of the curd
4. Protein content of the curd
1. Iron content of the curd
2. Vitamin B12 content of the curd
3. Vitamin D content of the curd
4. Protein content of the curd
Subtopic: Microbes in Household Products |
94%
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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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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