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Microbes in Human Welfare

Multiple Choice Questions

61.

A good producer of citric acid is

Aspergillus
Pseudomonas
Clostridium
Saccharomyces

62.

Which of the following statement(s) are true?

Antibiotics can kill bacteria, but disinfectants do not
Disinfectants have better bactericidal efficiency than antibiotics
Antibiotics are of microbial origin, but disinfectants are chemical compounds
Antibiotics can be injected into the patients, whereas disinfectants are not

63.

Which one of the following natural polymers is found both in insects and fungi?

Pectin
Chitin
Cellulose
Suberin

64.

Which one of the following antibiotics kills bacterial cells by inhibiting the polymerisation of peptidoglycan?

Aminoglycosides
Fluoroquinolones
Quinines
Penicillins

65.
Which one of the following organisms is not used as a biocontrol agent?

Bacillus sphaericus

Trichoderma viride

Bacillus thuringiensis

Bacillus subtilis

Bacillus subtilis

Bacillus subtilis is a Gram-positive bacteria found in soil and the gastrointestinal tract of ruminants and humans. It is not used as a biocontrol agent.

Bacillus sphaericus is used as a biocontrol agent.

Trichoderma species are free- living fungi that are very common in the root ecosystems. They are effective biocontrol agents of several plant pathogens.

Bacillus thuringiensis is used to control butterfly caterpillars. They are available in sachets as dried spores and are mixed with water and sprayed onto vulnerable plants such as brassicas and fruit trees.