MICROBIOLOGY OF SOILS QUIZ

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

generally smaller than

equal to

generally greater than

none of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Some microorganisms have the ability to increase the nitrogen content of soils, are called as

denitrification

nitrogen fixation

all of these

nitrification

TRUE ANSWER : ?
YOUR ANSWER : ?

Denitrification may be distinguished as

both (a) and (b)

blue baby syndrome

assimilative

dissimilative

TRUE ANSWER : ?
YOUR ANSWER : ?

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

both (a) and (b)

symbiotic

none of these

nonsymbiotic

TRUE ANSWER : ?
YOUR ANSWER : ?

The phenomenon of commensalism refers to a relationship between organisms in which

None of these

one species of a pair benefits

one species of a pair is more benefited

both the species of a pair benefit

TRUE ANSWER : ?
YOUR ANSWER : ?

Bacteria, as a group, are responsible for

nitrogen oxidation

nitrogen fixation

sulfur oxidation

all of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Hydrolytic

Transitional

All of these

methanogenic

TRUE ANSWER : ?
YOUR ANSWER : ?

The crops which are involved in nitrogen fixation are

soybean

alfalfa and clover

bean and lupine

all of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The diagnostic enzyme for nitrogen-fixing organisms is

none of these

nitrate reductase

nitrogenase

nitrate oxidase

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following soil microorganism is involved in the reduction of sulfates to H2S?

Rhodospirillum

Rhodomicrobium

Thiobacillus thiooxidans

Desulfotomaculum

TRUE ANSWER : ?
YOUR ANSWER : ?

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