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🔬 Science - Class 8
Unit 3 · Living Beings and Their Structure

Microorganisms Presentation

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Science and Technology, Grade 8, Unit 3

Microorganisms

Too small to see · In air, water and soil · Four main groups

What We Will Learn Today

🔬

What a microorganism is and what microbiology means

🦠

The build of a virus and its double nature

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How bacteria and amoeba are built, how they move and how they feed

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The mycelium of fungi and their saprophytic way of living

The first observation
How We Know They Are There
SET UP
Crack an egg a little on one side and leave it in a beaker for a few days.
OBSERVE
The egg rots and an unpleasant smell comes from it.
CONCLUDE
Unseen living things did the work. A microscope is needed to look at them.

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Presenter notes: Ask the class where the mould on damp bread comes from. Nobody puts it there, yet it arrives. Today's lesson is about that unseen world.