B7.3 Biodiversity and the effect of human interaction on ecosystems

Question 1

Give three causes of deforestation.

Answer 1

“1. Provide land for cattle or rice fields

2. Grow crops for biofuels
3. To clear space for building”

Question 2

Which 2 gases are increasing in the atmosphere and contributing to global warming?

Answer 2

“1. Carbon dioxide

2. Methane”

Question 3

What are the five main biological consequences of global warming?

Answer 3

“1. Increased spread of pathogens

2. Affecting migration patterns of animals
3. Melting of polar ice caps, causing flooding
4. Reduced habitats in polar regions
5. Reduced biodiversity”

Question 4

State three positive human interactions in an ecosystem.

Answer 4

“1. Breeding programmes for endangered species

2. Protection and regeneration of rare habitats
3. Reintroduction of field margins and hedgerows in agricultural areas where farmers grow only one type of crop
4. Reduction of deforestation and carbon dioxide emissions by some governments
5. Recycling resources rather than dumping waste in landfill”