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🔬 Science - Class 8
Unit 4 · Biodiversity and Environment

Causes of Biodiversity Degradation Presentation

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Science and Technology, Class 8 / Unit 4

Causes of Biodiversity Degradation

Twelve main causes · Human and natural · Examples from Nepal

What We Will Learn Today

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To define what the loss of biodiversity means

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To explain what overgrazing does to a forest and its wildlife

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To list the causes that come from human activity

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To understand the part played by natural disasters and climate change

The first cause
How Grazing Wears a Forest Away
GRASS
The animals first finish the soft grass on the ground.
SHOOTS
Once the grass is gone they eat the tips of the new seedlings.
SEEDS
Fallen fruits and seeds are eaten or crushed under hooves.
FOREST
No new trees come up, so the forest thins away.

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Presenter notes: Today we go through the reasons living things are growing fewer. Start by asking the class to name a plant, a bird or a fish that has become rare near their own home.