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Microbes in Aquatic Environment

Microbes in Aquatic Environment
Which of the following species in water reveal the presence of fecal pollution of human or animal origin?

E.coli
Clostridium perfringens
Fecal Streptococci
All of these

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Microbes in Aquatic Environment
The sulfur pearl of Namibia, Thiomargarita namibiensis

is the worlds largest bacterium
Both (a) and (b)
stores high concentrations of nitrate in a huge internal vacuole which takes up 98% of the organisms volume
is the worlds smallest bacterium

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Microbes in Aquatic Environment
Because it can be used with a variety of media and allow a resuscitation step the __________ technique has become the common and often preferred method of evaluating the microbiological characteristics of water.

most probable number
membrane filtration
MUG
Winogradsky

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Microbes in Aquatic Environment
Coliforms are used as indicator organisms because

they are present wherever enteric pathogens are present
None of these
both (a) and (b)
a testing procedure with great specificity is easy to perform

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Microbes in Aquatic Environment
Activated sludge undergoes

Tertiary treatment
any of these
Secondary treatment
Primary treatment

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Microbes in Aquatic Environment
Loss of carbon through the microbial loop in oligotrophic environments is __________ to/than the loss of carbon through the microbial loop in copiotrophic environments.

lesser
greater
approximately equal
half

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