MCQ
An infectious disease is:
- ✓Spread from person to person
- BCaused only by bacteria
- CCaused only by viruses
- DSpread from animal to animal
✓
Answer
Correct option: A.
Spread from person to person
Infectious diseases are caused by any pathogenic microorganisms such as bacteria, viruses, parasites or fungi. The diseases can be spread, directly or indirectly, from one person to another.
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Match different organisms in column I with their related characteristics in column II and select the correct option from the codes given below.
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Column I
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Column II
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$(a)$
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Entamoeba histolytica
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$(i)$
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A brown alga which is a rich source of iodine.
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$(b)$
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Bacteriophage
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$(ii)$
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A protozoan that causes disease in human beings by living in the large intestine of humans.
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$(c)$
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Penicillium
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$(iii)$
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A virus which infects a bacterial cell.
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$(d)$
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Fucus
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$(iv)$
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A fungus used to obtain anti.
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Match column $I$ with column $II$ and select the correct option from the codes given below.
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Column $I$
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Column $II$
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$(A)$
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Carbon dioxide in air
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$(i)$
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Damage ozone layer
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$(B)$
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Sulphur dioxide in air
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$(ii)$
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Produces acid rain
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$(C)$
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Chlorofluorocarbons
|
$(iii)$
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Prevents photosynthesis
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$(D)$
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Dust in air
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$(iv)$
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leads to gloabal warming
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