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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Column-I

 

Column-II

I.

Streptomyces     

A.    

Nitrogen fixation

II.

Rhizobium

B.

Source of antibiotics

III.   

Nitrosomonas

C.

Vinegar synthesis

IV.

Acetobacter

D.

Nitrification

Which of the combinations is correct?

 

I

II

III

IV

(1)    

B    

A    

D    

C

(2)

C

D

A

B

(3)

A

B

C

D

(4)

D

B

A

C

Subtopic:  Industrial Products, Beverages & Antibiotics | Microbes in Household Products | Microbes as Biofertilizer |
 83%
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  Column-I   Column-II
I. Methanogens A. Microbial biocontrol agent
II. Organic wastes B. Penicillin
III.     Bacillus thuringiensis    
C.     Biochemical oxygen demand
IV. Penicillium notatum D. Methanobacterium

Which of the combinations is correct?

  I II III IV
(1)    B       A       D       C
(2) C D A B
(3) D C A B
(4) D B A C
Subtopic:  Industrial Products, Beverages & Antibiotics | Microbes in Sewage Treatment | Microbes in Production of Biogas | Microbes in Biocontrol Agent |
 94%
From NCERT
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Column-I

 

Column-II

I.

Saccharomyces    

A.    

Bacteria

II.

Trichoderma

B.

Cyanobacteria

III.    

Lactobacillus

C.

Fungi

IV.

Nostoc

D.

Yeast

Which of the combinations is correct?

 

I

II

III

IV

(1)   

D      

C      

A      

B

(2)

C

D

A

B

(3)

A

B

C

D

(4)

D

B

A

C

Subtopic:  Chemistry of Fermented Beverages | Microbes in Household Products | Microbes in Biocontrol Agent | Microbes as Biofertilizer |
 86%
From NCERT
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