What is incorrect regarding organic farming?

1.  It relies on controlling pests by natural predation rather than introduced chemicals.
2.  A key belief of the organic farmer is that biodiversity furthers health.
3.  Pests are totally eradicated.
4.  Reduces dependence on toxic chemicals and pesticides.

Subtopic:  Microbes in Biocontrol Agent |
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Match each item in Column I [Bio-control agent] with the pest/pathogen in Column II and select the correct answer from the codes given below:

 

COLUMN I

 

COLUMN II

A.

Ladybird

a.

Aphids

B.

Dragonflies

b.

Mosquitoes

C.

Bacillus thuringiensis

c.

Butterfly caterpillars

D.

Trichoderma

d.

Fungi

Codes

A B C D
1. a b c d
2. b a c d
3. a b d c
4. b a d c

Subtopic:  Microbes in Biocontrol Agent |
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Baculoviruses are:
1. Species specific; Broad spectrum insecticides
2. Generalized; Broad spectrum insecticides
3. Species specific; Narrow spectrum insecticides
4. Generalized; Narrow spectrum insecticides

Subtopic:  Microbes in Biocontrol Agent |
 81%
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Match each item in Column I [Diazotroph] with the feature in Column II and select the correct answer from the codes given below:

 

Column I

 

Column II

A.

Cyanobacteria

a.

Actinorhizal symbiont

B.

Frankia

b.

Do not form nodules

C.

Rhizobium

c.

Free-living nitrogen fixer

D.

Azotobacter

d.

Legume symbiont

Codes

A B C D
1. a b c d
2. b a c d
3. a b d c
4. b a d c
Subtopic:  Microbes as Biofertilizer |
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Arbuscular mycorrhizas are formed only by fungi in the division:

1. Ascomycota 2. Glomeromycota
3. Basidiomycota 4. Microsporidia
Subtopic:  Microbes as Biofertilizer |
 56%

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What advantage does the mycobiont get in the mycorrhizal symbiotic relationship?

1. Adequate uptake of water
2. More availability of minerals like phosphorus
3. Availability of carbohydrates for energy
4. Resistance to diseases, drought, and salinity
Subtopic:  Microbes as Biofertilizer |
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In paddy fields, important biofertilizers are:

1.  Cyanobacteria 2. Rhizobium
3. Frankia 4. Glomus
Subtopic:  Microbes as Biofertilizer |
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The major problem with the use of chemicals to control plant diseases and pests is:
1. High cost
2. Ineffectivity against most pathogens
3. Difficulty in production
4. Non-specific nature

Subtopic:  Microbes in Production of Biogas | Microbes in Biocontrol Agent |
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The part of the complex stomach of ruminants that has methanogens present is the:

1. Omassum 2. Abomasum
3. Rumen 4. Reticulum
Subtopic:  Microbes in Production of Biogas |
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What is true regarding the activated sludge generated during the secondary treatment of sewage water?

I:  It is made up of aerobic bacteria that sediment down
II:  A large part of the activated sludge is pumped back into the aeration tank to serve as the inoculum.
III:  A minor part of the sludge is pumped into large tanks called anaerobic sludge digesters.

1. Only I 2. Only II and III
3. Only I and III 4. I, II and III

Subtopic:  Microbes in Sewage Treatment |
 61%
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