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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?

All of these
Fecal Streptococci
Clostridium perfringens
E.coli

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Microbes in Aquatic Environment
All of the following species are considered coliforms except

Salmonella typhi
Klebsiella pneumoniae
Enterobacter aerogenes
Escherichia coli

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Microbes in Aquatic Environment
The amount of oxygen dissolved in hypolimnion water in the winter is __________ to/than the amount of oxygen dissolved in hypolimnion water in the summer

half
greater
lesser
approximately equal to

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Microbes in Aquatic Environment
Coliforms are used as indicator organisms because

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

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

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

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Microbes in Aquatic Environment
Trickling filter comes under

tertiary treatment
primary treatment
none of these
secondary treatment

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