Question

1. A bottle of jam got spoiled and gave out an alcoholic smell due to the growth of *

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(a) Virus

(b)Yeast

 

(c ) Bacteria

(d) Algae

 

2. Once a person is infected with smallpox, he does not suffer from it again as his body contains *

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(a)antigens

(b)antibodies

 

(c )anticoagulants

(d)antibiotics

 

3. The bread that we have in our breakfast appears soft and fluffy due to the formation of *

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(a)carbon monoxide

(b)nitrogen

(c )carbon dioxide

 

(d)oxygen

 

4. Rahul stays at a place where water keeps stagnating and allows mosquitoes to breed. He is in danger of getting *

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(a)hepatitis B

(b)typhoid

(c)malaria

 

(d)tuberculosis.

 

5. Rohan bought a packet of pasteurised milk and drank without boiling it because it *

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(a)tasted sweet

(b)was free from micro-organisms.

 

(c )contained minerals and vitamins

(d)was proteinaceous in nature.

 

6. During high fever, my doctor asked me to take certain medicines that check the growth of micro-organisms and prevent the body temperature to rise. He asked me to take *

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(a)antibodies

(b)antigens

(c )antibiotics

 

(d)analgesics

 

7. On an educational tour to dairy company, I saw workers adding Lactobacillus culture to milk because it *

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(a)increases the flavour

(b)acts as an antibiotic

(c )multiplies and promotes the formation of curd.

(d)prevents the milk to turn sour

 

8. Amar drank water from a local tap in the playground in his locality and fell ill. He is suffering from *

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(a)measles

(b)malaria

(c )typhoid

 

(d)tuberculosis

 

9. My mother cooked chicken for me which on the next morning gave a bad smell, bad taste and changed its colour due to *

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(a)added colours

(b)spoilage

 

(c)poisoning

(d)over cooking

 

10. A farmer collects vegetable peels and other organic wastes and dumps them in a pit everyday. He is doing so to convert them into *

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(a)fertilisers

(b)humus

 

(c )soil

(d)manure



 

11. On a fine rainy day, during breakfast, I saw dull yellow cottony thing on a slice of bread which was due to the growth of *

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(a)bacterium

(b)fungus

 

(c )alga

(d)virus

 

12. During the summer season, my father got a juice packet and asked me to add water in it as the juice is very sweet. What is the reason of adding excess amount of sugar in it? *

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(a) sugar enhances the flavour of juice

(b)sugar makes the juice thick

(c )sugar inhibits the growth of bacteria

 

(d)sugar causes fermentation of juice

 

13. Salts, sugars and oils are the common chemicals used to check the growth of microorganisms. Thus, they are called as *

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(a)fixers

(b)preservatives

 

(c )poison

(d)pathogens

 

14. For pasteurisation milk is boiled up to *

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(a) 50 C

(b) 55 C

(c ) 60C

(d) 70 C

 

 

15. The algae are rich sources of *

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(a)fats

(b)carbohydrates

(c )vitamins

(d)minerals and proteins

 

 

16. The HIV virus causes *

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(a)common cold

(b)dysentery

(c )AIDS

 

(d) foot and mouth disease

 

17. Protozoan ‘Plasmodium’ is the causative agent of *

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(a)diphtheria

(b)malaria

 

(c )diarrhoea

(d)anaemia

 

18. Refrigeration is considered a good method of preservation because it *

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(a) speeds the multiplication of micro-organisms

(b) retards the growth of micro-organisms

 

(c ) kills the micro-organisms

(d) activates the micro-organisms

 

19. Microorganisms helps to fix nitrogen in the soil and improves its *

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(a)texture

(b)colour

(c )fertility

 

(d)porosity

 

20. The micro-organism that causes common cold is *

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(a )bacteria

(b)algae

(c )virus

 

(d)protozoa


From which book or guide it is given for class 8 CHAPTER 2 microorganisms anyone knows
please say I will mark his answer as the brainliest answer

​

Answer 1

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1) Due to the growth of Yeast.

2) antibiotics

3) carbon monoxide

4) malaria

5) contains minerals and vitamins

6) antibiotics

7) acts as an antibiotic

8) typhoid

9) spoilage

10) humus

11)fungus

12)sugar makes the juice thick

13) preservatives

14)60°C

15) carbohydrates

16) dysentery

17)malaria

18)kills the microorganisms

19)texture

20)virus

Answer 2

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• Due to the growth of Yeast.

• antibiotics

• carbon monoxide

• malaria

• contains minerals and vitamins

• Antibiotics

• acts as an antibiotic

• typhoid

• spoilage

• humus

• fungus

• sugar makes the juice thick

• preservatives

• 60°C

• carbohydrates

• dysentery

• malaria

• kills the microorganisms

• texture

• virus

$<font color="red">$$<b >$$<marquee>$ Hope it helps

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