NCERT Solutions for Class 8 Science Science - NCERT Solution Chapter 2

Microorganisms : Friend and Foe Class 8

Chapter 2 Microorganisms : Friend and Foe Exercise Solutions

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Exercise : Solutions of Questions on Page Number : 29

Q1 :  

Fill in the blanks:

(a) Microorganisms can be seen with the help of a _________.

(b) Blue green algae fix _________ directly from air to enhance fertility of soil.

(c) Alcohol is produced with the help of _________.

(d) Cholera is caused by _________.


Answer :

(a) Microorganisms can be seen with the help of a _microscope _.

(b) Blue green algae fix __ nitrogen_ directly from air to enhance fertility of soil.

(c) Alcohol is produced with the help of _yeast _.

(d) Cholera is caused by _ bacteria_.

Answer needs Correction? Click Here

Q2 :  

Tick the correct answer:

(a) Yeast is used in the production of

(i) sugar (ii) alcohol

(iii) hydrochloric acid (iv) oxygen

(b) The following is an antibiotic

(i) Sodium bicarbonate (ii) Streptomycin

(iii) Alcohol (iv) Yeast

(c) Carrier of malaria-causing protozoan is

(i) female Anopheles mosquito (ii) cockroach

(iii) housefly (iv) butterfly

(d) The most common carrier of communicable diseases is

(i) ant (ii) housefly

(iii) dragonfly (iv) spider

(e) The bread or idli dough rises because of

(i) heat (ii) grinding

(iii) growth of yeast cells (iv) kneading

(f) The process of conversion of sugar into alcohol is called

(i) nitrogen fixation (ii) moulding

(iii) fermentation (iv) infection


Answer :

(a) Yeast is used in the production of

(i) sugar (ii) alcohol

(iii) hydrochloric acid (iv) oxygen

(b) The following is an antibiotic

(i) sodium bicarbonate (ii) streptomycin

(iii) alcohol (iv) yeast

(c) Carrier of malaria-causing protozoan is

(i) female Anopheles mosquito (ii) cockroach

(iii) housefly (iv) butterfly

(d)The most common carrier of communicable diseases is

(i) ant (ii) housefly

(iii) dragonfly (iv) spider

(e)The bread or idli dough rises because of

(i) heat (ii) grinding

(iii) growth of yeast cells (iv) kneading

(f) The process of conversion of sugar into alcohol is called

(i) nitrogen fixation (ii) moulding

(iii) fermentation (iv) infection

Answer needs Correction? Click Here

Q3 :  

Match the organisms in Column I with their action in Column II.

Column I

Column II

(i)

Bacteria

(a)

Fixing nitrogen

(ii)

Rhizobium

(b)

Setting of curd

(iii)

Lactobacillus

(c)

Baking of bread

(iv)

Yeast

(d)

Causing malaria

(v)

A protozoan

(e)

Causing cholera

(vi)

A virus

(f)

Causing AIDS

(g)

Producing antibodies


Answer :

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Q4 :  

Can microorganisms be seen with the naked eye? If not, how can they be seen?


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Q5 :  

What are the major groups of microorganisms?


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Q6 :  

Name the microorganisms which can fix atmospheric nitrogen in the soil.


Answer :

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Q7 :  

Write 10 lines on the usefulness of microorganisms in our lives.


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Q8 :  

Write a short paragraph on the harms caused by microorganisms.


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Q9 :  

What are antibiotics? What precautions must be taken while taking antibiotics?


Answer :

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