Question

.(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

03 Synthetic Fibres and plastics

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

All Chapters | 

Answer 1

.(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.