Microorganisms: Friends and Foe (Practice Sheet, Class 8)

(1)Write “T” against the sentences which are true and write “F” against the sentences which are false.

(i) Viruses are microorganisms.

(ii) Food can not preserved by using salt.

(iii) Microorganisms are responsible for maintaining the nitrogen in the atmosphere.

(iv) Air is not a mode of transmission of diseases.

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(2) Define communicable diseases. Give some example of it.

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(3) What are carriers? How they spread diseases among human?

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(4) What is food preservation? Name some food preservatives?

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(5)Define nitrogen cycle and explain it.

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(6) Write a short note on diseases spread by microorganisms in plants.

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Choose the correcr answeres:-

(7) Pasteurised milk can be drink without boiling.  Yes /No

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(8) Microorganisms are

(i) single celled

(ii) multi celled.

(iii) Both

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(9) Microorganisms can survive in

(i) cold areas

(ii) deserts

(iii) both

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(10) Can taking antibiotics useful in cold or flu?

Solution-

Helping Topics

Microorganisms: friend and foe

NCERT solutions, class 8

Vaccination

Fermentation

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