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CAIE IGCSE Biology 20.4 Conservation Questions

Practise conservation questions by applying sustainable-resource ideas, matching endangered-species threats to protection methods and managing fish or forests.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • Identify forests and fish stocks as renewable resources and compare replacement rates with removal rates.
  • Explain how habitat loss, hunting, overharvesting, pollution, climate change or introduced species threaten named populations.
  • Match monitoring and habitat protection to threats affecting endangered wild populations.
  • Explain captive breeding, reintroduction and seed banks as ex-situ conservation methods for rebuilding or preserving populations.
  • Use quotas, selective felling, replanting, education or protected areas to maintain forest cover and conservation compliance.
  • Explain how fish quotas, closed seasons, protected areas, larger mesh sizes, monitoring and enforcement protect breeding stocks.
  • Link conservation to biodiversity, extinction risk, ecosystem food webs, nutrient cycling and resources such as food, drugs, fuel or genes.
  • Sequence artificial insemination and in-vitro fertilisation, compare their fertilisation sites, and identify semen, eggs and embryo transfer.
  • Relate small populations to reduced genetic variation, then explain inbreeding, harmful recessive alleles, weak adaptation and disease or extinction risk.

Covered syllabus points

20.4.1—Sustainable resource as one which is20.4.2—Some resources can be conserved20.4.3—Organisms become endangered or extinct20.4.4—Endangered species can be conserved20.4.5—Forests can be conserved using20.4.6—Fish stocks can be conserved using20.4.7—Reasons for conservation programmes20.4.8—Use of artificial insemination (AI)20.4.9—Risks to a species if its population

Question 1

[Maximum number: 1]

Lignin is used to make a sustainable resource known as bioplastic.
Why is bioplastic a sustainable resource?

A

Lignin can be produced as rapidly as it is removed from the environment.

B

Lignin is found in xylem tissue.

C

Lignin is strong.

D

Lignin is waterproof.

Question 2

[Maximum number: 1]

What is an example of sustainable use of resources?

A

allowing only young fish to be caught

B

cutting down a forest and not replanting trees

C

controlling the number of fish caught with quotas

D

planting deforested areas with one species of crop plant

Question 3

[Maximum number: 1]

What are two reasons for organisms becoming endangered?

1 habitat destruction
2 monitoring
3 education
4 pollution
5 captive breeding programmes

A

1 and 4

B

1 and 5

C

2 and 3

D

3 and 4

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