Q60 of 104 Page 40

Name one plant disease each caused:

(a) by fungi


(b) by virus


(c) by bacteria

(a) The plant disease, Rust of wheat is caused by fungi.

(b) Yellow vein Virus Insect mosaic of bhindi (Okra), a plant disease, is caused by virus.


(c) Citrus canker is caused by bacteria.


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State the beneficial effects (or usefulness) of micro-organisms in our lives.

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Describe the method of pasteurization for the preservation of milk.

 61

Which disease is spread by:

(a) female Anopheles mosquito?


(b female Aedes mosquito?

 62

Name two fruits which are preserved:

(a) in the form of pickles


(b) in the form of jams.