MICROBES IN AQUATIC ENVIRONMENT QUIZ

Which of the following techniques may be performed quantitatively to determine the number of bacteria of a particular type?

Pour plate

Streak plate technique

Both (a) and (b)

Spread plate

TRUE ANSWER : ?
YOUR ANSWER : ?

The solidifying agent commonly used in preparation of media is/are

agar

none of these

silica gel

both (a) and (b)

TRUE ANSWER : ?
YOUR ANSWER : ?

A medium containing crystal violet dye plus sodium deoxycholate will allow

gram (+)ve intestinal bacteria to grow

aquatic bacteria to grow

gram (-)ve intestinal bacteria to grow

none of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Stuart's transport medium is used for transport of specimen containing

Vibrio cholerae

Salmonella

Neisseria gonorrhoeae

Shigella

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following bacteria can grow in acidic pH?

Vibrio cholerae

Salmonella

Lactobacilli

Shigella

TRUE ANSWER : ?
YOUR ANSWER : ?

For the selection of endospore-forming bacteria, a mixed culture can be heated at

60°C for 10 minutes

80°C for 10 minutes

70°C for 10 minutes

90°C for 10 minutes

TRUE ANSWER : ?
YOUR ANSWER : ?

Peptone water and nutrient broth are

selective media

basal media

enriched media

none of these

TRUE ANSWER : ?
YOUR ANSWER : ?

To select cholera-causing bacterium, Vibrio cholerae, the pH of the medium is maintained at a pH of

8.5

6.79

8.90

3.5

TRUE ANSWER : ?
YOUR ANSWER : ?

Agar is used for solidifying culture media because

it does not affect by the growth of bacteria

All of these

the melting and solidifying points of agar solution are not the same

it does not add to the nutritive properties of the medium

TRUE ANSWER : ?
YOUR ANSWER : ?

A disease producing species occurring in a mixed culture can often be selected on the basis of its

pathogenic properties

special nitrogen source

none of these

special carbon source

TRUE ANSWER : ?
YOUR ANSWER : ?

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