CAIE IGCSE Biology 20.4.3 Causes of Endangerment & Extinction
Practise explaining how climate change, habitat destruction, hunting, overharvesting, pollution and introduced species threaten populations.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- select valid threats rather than conservation methods from a list or species context
- explain how habitat loss, hunting or overharvesting lowers population size and reproduction
- apply pollution, climate change or introduced-species effects to a named organism
20.4.3—Organisms become endangered or extinct question 1
[Maximum number: 3]
Many species of spider are thought to be endangered.
State three reasons why animal species such as spiders become endangered.
1
2
3
hunting / collecting / AW ; pollution ; pesticide(s) / insecticide / (chemical) spray(s) that kill animals / poisons ;
loss of habitat / any example ;
disease ;
increased competition / described ;
increase in predator(s) ;
climate change / any example ;
lack of food / loss of prey species ;
AVP ;
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