IGCSEScienceCambridge (CIE)Combined ScienceBiologyExam Questions16. Human Influences on EcosystemsHuman Impact: Biodiversity, Pollution & Conservation

Human Impact: Biodiversity, Pollution & Conservation (Cambridge (CIE) IGCSE Combined Science: Biology): Exam Questions

Exam code: 0653

4 mins3 questions
1
1 mark

Biodiversity is the number of different …R… in an area.

Which word replaces R in the sentence?

  • food chains

  • food webs

  • organisms

  • species

Choose your answer

2
1 mark

Since the introduction of grey squirrels into the UK, the number of red squirrels has decreased from 3.5 million to about 150 000.

The statements give possible reasons for this decrease.

  1. Grey squirrels brought a disease (squirrelpox) which kills red squirrels.

  2. Grey squirrels are better at getting food than the red squirrels.

  3. Red squirrels are less obvious to predators.

Which statements could explain this decrease in the number of red squirrels?

  • 1 only

  • 1 and 2 only

  • 2 and 3 only

  • 1, 2 and 3

Choose your answer

3
2 marks

Plants are an important part of the biodiversity of an ecosystem.

Explain the effect of deforestation on biodiversity.

How did you do?