MICROBIOLOGY OF SOILS QUIZ

The physical structure of soil is improved by the accumulation of

all of these

water

minerals

mold mycelium

TRUE ANSWER : ?
YOUR ANSWER : ?

In the process of nitrogen fixation, which of the following microorganism is involved?

None of these

Non symbiotic and symbiotic microorganisms only

Symbiotic microorganisms only

Non symbiotic microorganisms only

TRUE ANSWER : ?
YOUR ANSWER : ?

Assimilative denitrification is done by

plants

all of these

prokaryotes

fungi

TRUE ANSWER : ?
YOUR ANSWER : ?

Denitrification is carried out

predominantly by Pseudomonas spp

usually by facultative anaerobes

predominantly by Bacillus spp

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The population of algae in soil is __________ that of either bacteria or fungi.

generally greater than

equal to

generally smaller than

none of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Which are the main source of biofertilisers?

Streptococcus

Bacillus

None of these

Cyanobacteria

TRUE ANSWER : ?
YOUR ANSWER : ?

The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?

All of these

Transitional

Hydrolytic

methanogenic

TRUE ANSWER : ?
YOUR ANSWER : ?

The groups of bacteria which have the ability to fix nitrogen from air to soil are

both (a) and (b)

nonsymbiotic

none of these

symbiotic

TRUE ANSWER : ?
YOUR ANSWER : ?

The nitrogenase consists of

both (a) and (b)

dinitrogenase reductase

dinitrogenase

none of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Bacteria, as a group, are responsible for

all of these

nitrogen oxidation

sulfur oxidation

nitrogen fixation

TRUE ANSWER : ?
YOUR ANSWER : ?

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