The amount of oxygen required by the microbes in the decomposition of organic matter is called:

1. Chemical oxygen demand

2. Biochemical oxygen demand

3. Total oxygen demand

4. Dissolve oxygen

Subtopic:  Microbes in Sewage Treatment |
 96%
From NCERT
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The mixture of gases released during anaerobic digestion of sludge is called:

(1) Methane

(2) Carbon dioxide

(3) Biogas

(4) Flammable gases

Subtopic:  Microbes in Production of Biogas |
 84%
From NCERT
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Biogas contains:

(1) CO2

(2) H2S

(3) CH4

(4) All of these

Subtopic:  Microbes in Production of Biogas |
 97%
From NCERT
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The symbiotic association between fungi and roots of higher plants is called:

1. Lichen

2. Mycorrhiza

3. Biofertilizer

4. BOD

Subtopic:  Microbes as Biofertilizer |
 94%
From NCERT
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The organisms which are used to enrich the nutrient quality of the soil are called:

1. Mycorrhiza

2. Biofertilizers

3. Yeast

4. Methanogens

Subtopic:  Microbes as Biofertilizer |
 86%
From NCERT
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Which of the following serve as biofertilizer in paddy fields?

(1) Bacteria

(2) Yeast

(3) Cyanobacteria (blue-green algae)

(4) Fungi

Subtopic:  Microbes as Biofertilizer |
 92%
From NCERT
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The solids which settle after primary treatment of sewage are called:

(1) Primary sludge

(2) Activated sludge

(3) Flocs

(4) Total solids

Subtopic:  Microbes in Sewage Treatment |
 73%
From NCERT
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Given below are three statements (A-B) each with one or more blanks. Select the option which correctly fills the blanks in the statements Statements:

A. Bioactive molecule, ________ is used as immunosuppressive agent in organ transplant patients, It is produced by the fungus ________.
B. Primary treatment of sewage involves physical removal of small and large particles through ________.


1. A - Antibiotic, Trichoderma polysporum; B - filtration and sedimentation

2. A - Cyclosporin A, Trichoderma polysporum; B - filtration and sedimentation

3. A - Cyclosporin A, Trichoderma polysporum; B - Centrifugation and sedimentation

4. A - Antibiotic, Trichoderma polysporum; B - Centrifugation and sedimentation

Subtopic:  Chemicals, Enzymes & Other Bioactive Molecules | Microbes in Sewage Treatment |
 93%
From NCERT
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Given below are three statements (A-B) each with one or more blanks. Select the option which correctly fill the blanks in the statements Statements:

A. Microbes consume the major part of the organic matter in the effluent and reduce _________ of sewage.

B. Certain bacteria which grow anaerobically on cellulosic material, produce large amount of methane along with CO2 and H2. The bacteria are commonly called as _________ and one such common bacterium is _________. Options:

(1) A - CO2 demand; B - methanogens, Methanobacterium

(2) A - Carbon; B - methanogens, Methanobacterium

(3) A - biochemical oxygen demand; B - methanogens, Methanobacterium

(4) A - biochemical oxygen demand; B - Methylokorus infemorum

Subtopic:  Microbes in Sewage Treatment | Microbes in Production of Biogas |
 93%
From NCERT
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The below diagram shows a typical biogas plant. Which of the following four option, products labelled as A are correctly identified:

1. A - Sludge; B - Methane, Oxygen; C - Dung, water

2. A - Sludge; B - Methane, Carbon dioxide; C - Dung, water

3. A - Sludge; B - Ethylin, Carbon dioxide; C - Dung, water

4. A - Sludge; B - Methane, Carbon dioxide; C - Sewage

Subtopic:  Microbes in Production of Biogas |
 81%
From NCERT
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