.(e) The bread or idli dough rises because of
(i) heat
(ii) grinding
(iii) growth of yeast cells
(iv) kneading
✔ Q.(f) The process of conversion of sugar into alcohol is called
(i) nitrogen fixation
(ii) moulding
(iii) fermentation
(iv) infection
✔ Q.3. 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
✔ Q.4. Can microorganisms be seen with the naked eye? If not, how can they be seen?
✔ Q.5. What are the major groups of microorganisms?
✔ Q.6. Name the microorganisms which can fix atmospheric nitrogen in the soil.
✔ Q.7. Write 10 lines on the usefulness of microorganisms in our lives.
✔ Q.8. Write a short paragraph on the harms caused by microorganisms.
✔ Q.9. What are antibiotics? What precautions must be taken while taking antibiotics?
✔ Q.1. 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 _________.
✔ Q.(e) The bread or idli dough rises because of
(i) heat
(ii) grinding
(iii) growth of yeast cells
(iv) kneading
✔ Q.(f) The process of conversion of sugar into alcohol is called
(i) nitrogen fixation
(ii) moulding
(iii) fermentation
(iv) infection
✔ Q.3. 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
✔ Q.4. Can microorganisms be seen with the naked eye? If not, how can they be seen?
✔ Q.5. What are the major groups of microorganisms?
✔ Q.6. Name the microorganisms which can fix atmospheric nitrogen in the soil.
✔ Q.7. Write 10 lines on the usefulness of microorganisms in our lives.
✔ Q.8. Write a short paragraph on the harms caused by microorganisms.
✔ Q.9. What are antibiotics? What precautions must be taken while taking antibiotics?
✔ Q.2. Tick the correct answer:
(a) Yeast is used in the production of
(i) sugar
(ii) alcohol
(iii) hydrochloric acid
(iv) oxygen
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01 Crop Production and Management
02 Microorganisms: Friend and Foe
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04 Materials: Metals and Non Metals
05 Coal and Petroleum
06 Combustion and Flame
07 Conservation of Plants and Animals
08 Cell: Structure and Functions
09 Reproduction in Animals
10 Reaching the Age of Adolescence
11 Force and Pressure
12 Friction
13 Sound
14 Chemical Effects of Electric Current
15 Some Natural Phenomena
16 Light
17 Stars and Solar System
18 Pollution of Air and Water
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Answers
Answered by
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.(e) = (iii) growth of yeast cells
(f) = fermentation
Q3.
1) rhizobium = fixing nitrogen
2) lactobacillus = setting of curd
3) yeast = baking of bread
a protozoan = causing malaria
4) bacteria = a virus
Q4.
no they cannot be seen through naked eyes
they can be seen from a good quality microscope.
(f) = fermentation
Q3.
1) rhizobium = fixing nitrogen
2) lactobacillus = setting of curd
3) yeast = baking of bread
a protozoan = causing malaria
4) bacteria = a virus
Q4.
no they cannot be seen through naked eyes
they can be seen from a good quality microscope.
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