Q1
An organism too small to see without a microscope is called a:
Amicroorganism
Bmammal
Creptile
Damphibian
CBSEClass 8 (CBSE)ScienceCh 2 · Topic 1
Microorganisms - An Introduction
Learning about the tiny living organisms invisible to the naked eye.
Core concept
Bacteria are single-celled organisms that can be helpful (like those used in curd-making) or harmful (causing diseases like cholera). Viruses are even smaller than bacteria and can only reproduce inside a living host cell, causing diseases like the common cold and chickenpox. Fungi include yeasts and moulds, some useful (like yeast in bread-making) and some harmful (causing skin infections). Protozoa are single-celled organisms, some of which cause diseases like malaria.
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• Microorganisms include bacteria, viruses, fungi, and protozoa.
• They are found almost everywhere: soil, water, air, and inside living bodies.
• Bacteria: single-celled; can be helpful (curd) or harmful (cholera).
• Viruses need a living host cell to reproduce; fungi include yeast and moulds.