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CAIE IGCSE Biology 20.2 Habitat Destruction Questions

Practise habitat-destruction questions by defining biodiversity, explaining forest clearance and linking deforestation to soil, flooding and carbon dioxide.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • define biodiversity and calculate forest-cover change from tables or graphs
  • explain forest clearance for housing, farming, timber and natural-resource extraction
  • link deforestation to biodiversity loss, extinction, soil erosion, flooding and carbon dioxide

Covered syllabus points

20.2.1—Biodiversity as the number20.2.2—Reasons for habitat destruction20.2.3—Through altering food webs and food20.2.4—Undesirable effects of deforestation

Question 1

[Maximum number: 1]

Which term describes the number of different species living in an area?

A

biodiversity

B

conservation

C

ecosystem

D

population

Question 2

[Maximum number: 3]

Forest ecosystems are threatened by many human activities.

Describe reasons why people cut down forests.

Question 3

[Maximum number: 4]

Some crop farmers use herbicides on their fields.
Fig. 4.1 shows a farmer spraying a rice crop with herbicides.

Fig. 4.1

Fig. 4.1

Fields of crop plants were sprayed with two herbicides. A farmer measured the concentration of the two herbicides, A and B, in a lake near the fields.

The water in the lake was sampled at intervals for two weeks.
Fig. 4.2 shows the results.
concentration of herbicides in the lake water samples / mg per kg

Fig. 4.2

Fig. 4.2

Suggest how herbicides damage ecosystems in a lake.

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