Environment and Ecosystems

Where this fits in the syllabus

Grade 10 · Term 3

Key points to revise

Revise Environment and Ecosystems fast with concise, exam-ready key points

About O/L Science: O/L Science integrates physics, chemistry, and biology into a single subject across Grade 10 and 11.

• Greenhouse effect: CO₂, CH₄, N₂O, H₂O vapour trap infrared → warm Earth
• Enhanced greenhouse effect → global warming → climate change (floods, droughts, sea rise)
• Pollution types: air (SO₂, NOₓ, particulates), water (fertilisers, sewage), land (plastics, pesticides)
• Deforestation → less CO₂ absorbed; soil erosion; habitat loss

Must know

• Enhanced greenhouse effect → global warming → climate change
• Acid rain: SO₂ + H₂O → H₂SO₄; damages forests, lakes, buildings
• Ozone layer: absorbs UV; CFCs deplete it
• Conservation: biodiversity protection, reforestation, renewable energy, recycling

Source: NIE O/L Science Grade 11 — Unit 7: Environmental Science

Builds toward

Related Topics

In the Syllabus