CLASS -8
(Microorganism:
Friend and Foe)
Multiple
Choice Question- (1 Marks Each)
1.Bacteria are classified
according to their:
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i) Shape
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ii) size
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iii) color
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iv) none of these
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2.
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The first antibiotic discovered was:
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i) Penicillin
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ii) Tetracycline
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iii) Streptomycin
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iv) Bacitracin
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3.
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Cholera is caused by:
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i) vibrio cholera
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ii) clostridium tetani iii)
salmonella typhi
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iv) none of these
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4.
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A common bacterial disease in plants
is:
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i) Citrus canker
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ii) Rabies
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iii) Polio
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iv) All of these
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5.A common food preservative is:
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i) Benzoic acid
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ii) Hydrochloric acid iii) Sulphuric
acid
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iv) Nitric acid
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6.
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An edible fungi is:
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i) Mould
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ii) Mushroom
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iii) Algae
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iv) None of these
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7.
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The smallest microorganism is:
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i) Algae
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ii) Protozoan
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iii) Bacterium
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iv) Virus
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8.
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Algae are:
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i) Autotrophs ii) Parasites iii)
Heterotrophy
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iv) Saprophytes
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9.
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The microorganisms that play an
important role in maintaining the balance of
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nitrogen gas in the
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atmosphere are:
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i) Bacteria
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ii) Algae
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iii) Virus
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iv) Protozoa
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10. Which of these are added to dough to make
it rise?
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i) Yeast
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ii) Algae
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iii) garbage
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iv) all of
these
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Fill
in the blanks:- (1 Marks Each)
1.Microorganisms
can be seen with the help of a ……………………..
2.Blue
green algae fix ……………….. Directly from air to enhance fertility of soil.
3.Alcohol
is produced with the help of ……………………….
4.Cholera
is caused by …………………….
5.…………………..
are non-green plants.
6.…………………..
cause fermentation.
7.………………………..
and ………………………. Are diseases caused by fungi in humans.
8.A
………………….. found in the intestine of termite, help them to digest word
cellulose.
9.……………………
only multiply in the body of a living organism.
10.………………..
is a fatal disease of humans as well as cattle.
Very
Short Answer Question: (1 Marks Each)
1.Write
the names of some diseases caused by virus.
2.What
is the main ingredient of rava idlis and bhaturas.
3.What
is fermentation?
4.Mention
tow groups of Microorganisms on the basis of their functions?
5.Name some diseases caused
by protozaans.
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Short answer
questions:
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(2 Marks
Each)
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1.What are microorganisms?
2.How do microbes survive in
adverse conditions?
3.How bacteria are useful to
us?
4.What is virus?
5.What is fermentation? Where is it used?
6.Write two common bacterial
disease of human and write preventive measures for it?
7.What is the role of yeast
in baking industry ?
8.Write sum commercial use of
microorganisms?
9.What is pasteurization of
milk?
10.How do microorganisms spoil
food?
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Answer these
question
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(3 Marks
Each)
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1.
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What are major groups of
microorganisms?
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2.
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Draw any protozoa and Label its part.
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3.
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What are the antibiotics? What
precautions one should take while taking them?
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4.
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How do bacteria help in increasing
soil fertility? Explain.
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5.
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Classify the bacteria according to
their shape.
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6.
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What are communicable diseases ?
Explain with examples.
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7.
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What do you mean by food poisoning ?
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8.
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Explain how does a vaccine work?
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9.
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Describe the role of blue green alae
and bacteria in fertility of soil ?
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10.
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Give one
example of each.
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i) an edible fungi
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ii) antibiotic obtained from fungi
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iii) a parasitic protozoan
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iv) nitrogen fixing bacteria
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v) a bacteria residing in intestines
of man
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vi) what is nitrogen cycle
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Long answer
questions.
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(5 Marks
Each)
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1.Draw and explain the
harmfull effects of bactria with Example.
2.What are food preservatives
? Explain some common food preservatives.
3.Explain cousative
microorganisms, mode of transmission and preventive measure of the humand
diseases like Tuberculosis, Measles, Chicken pox, Polio, Cholera, Typhoid,
Hepatitis B and Maleria etc.
4.Explain Nitrogen Cycle with
the help of Label Diagram?
5.Draw different types of
fungi and write useful and harmful effect of fungi.
