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12th Biology 2016 Set1 Delhi Board Paper Solution

Question 22

Given below is a list of six micro-organisms. State their usefulness to humans.

Nucleopolyhedrovirus

Saccharomyces cerevisiae

Monascus purpureus

Trichoderma polysporum

Penicillium notatum

Propionibacterium sharnanii

Answer

Usefulnes to humans:

(1) Nucleopolyhedrovirus:

It is a biological control agent

it is a species-specific insectiside. 

 

(2) Saccharomyces cerevisiae

It is used to ferment bread dough.

It is used in the preparation of ethanol by fermenting fruit juices and cereals

 

(3) Monascus purpureus:

It is used for producing statins for lowering blood cholestrol.

 

(4) Trichoderma polysporum:

It is used for producing cyclosporin A which is used as an immunosuppressive agent in organ transplant patients.

 

(5) Penicillium notatum:

Used for producing antibiotic penicillin.

 

(6) Propionibacterium sharnanii:

It helps in ripening of swiss cheese.It is also responsible for the appearance of large holes in the cheese, as it produces high amount of carbon dioxide.