Q1
What are bacteria?
ASingle-celled microorganisms
BMulti-celled large organisms
COnly harmful microbes
DNon-living particles
SSCClass 8 (SSC)Science (सामान्य विज्ञान)Ch 1 · Topic 2
Practice and Revision - Living World and Classification of Microbes
Let us practise and revise what we learned about living world and classification of microbes. Microbes are tiny organisms invisible to the n
Core concept
Bacteria are single-celled microorganisms, some beneficial (helping digestion) and others harmful (causing diseases like tuberculosis).
How it works
Viruses are microscopic agents that can only reproduce inside living host cells, causing diseases like influenza and common cold.
Why it matters
Fungi include yeasts and moulds, some beneficial (used in bread-making) and others harmful (causing infections or crop damage).
Key detail
Protozoa are single-celled organisms, some causing diseases like malaria, while others play important roles in ecosystems.
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Key diagram
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Quick notes
• Bacteria: single-celled, beneficial or harmful.
• Beneficial: aid digestion. Harmful: cause disease.
• Viruses: reproduce only inside host cells.
• They cause flu, common cold.
• Fungi: yeasts, moulds.
• Beneficial: bread-making. Harmful: infections.
• Protozoa: single-celled organisms.
• Some cause malaria, others aid ecosystems.