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PUMPA - SMART LEARNING

எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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Subjects
Science CBSE
Class 8
Microorganisms - Friend and Foe
Helpful and diseasecausing microorganisms

43. Bacteria, fungi, and virus

Exercise condition:

5 m.

Choose the best answer:

1. A farmer uses chemical pesticides and insecticides in his farmland. Which of the following is correct?

a. They are beneficial to both human beings and animals
b. They pollute our environment
c. They kill both harmful and beneficial organisms.
d. Both a and b
e. Both b and c

2. There are two dustbins around the street corner of Kevin's house. One dustbin have spoiled food and other have plastic wastes. He has a doubt that why smell always comes from the dustbin with spoiled food.

Dustbin with spoiled food is decomposed by microbes which releases gases with strong odour. But plastic cannot be decomposed by microbe.
Dustbin with spoiled food absorb the atmospheric gases and release it back . But plastic cannot absorb any gases from atmosphere.
Dustbin with spoiled food decompose the dustbin itself which gives the odour. . But plastic cannot decompose any material.
None of the above

3. Which of the following is present in a cell and absent in a virus?

Cell wall
RNA
DNA
All the above

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