Ecology: pollution and its effects — KCSE Biology

KCSE Biology · 84 practice questions · 3 syllabus objectives

29 easy30 medium25 hard

What You'll Learn

Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.

Describe types of pollution and their effects on organisms

State measures to control pollution

Ecology: pollution and its effects

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easySHORT ANSWER4 marks

State two effects of deforestation for charcoal on the environment.

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Part (a) — 4 marks

Leads to deforestation / loss of tree cover / habitat destruction (1 mk)

Causes soil erosion due to removal of vegetation cover (1 mk)

Releases carbon dioxide and smoke contributing to air pollution and climate change (1 mk)

Reduces rainfall / disrupts the water cycle in the area (1 mk)

easySHORT ANSWER2 marks

Identify two strategies that can be used to control soil pollution caused by agricultural practices. (2 marks)

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Part (b) — 2 marks

Promote organic farming to reduce chemical pesticide usage (1 mk)

Encourage crop rotation to maintain soil health and reduce chemical accumulation (1 mk)

easySHORT ANSWER3 marks

Identify three measures that can be implemented to reduce air pollution in urban areas. (3 marks)

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Part (a) — 3 marks

Promote the use of public transport to reduce vehicle emissions (1 mk)

Implement stricter emission standards for industries (1 mk)

Encourage the use of renewable energy sources like solar and wind (1 mk)

State four causes of air pollution in urban areas. (4 marks)

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