B7.3 Humans impacts and biodiversity

What is biodiversity?

• 
  A measure of how many different species live in an ecosystem

• 
  All organisms in a food web depend upon each other

• 
  All the food chains for a habitat combined

• Biotic and abiotic factors combined

What term describes the graph of World human population increase?

• 
  Normal distribution

• 
  Exponential

• 
  Linear

• Explosive

Which of these is not a reason for an increase in human population?

• 
  Better health care

• 
  Intensive farming

• 
  Antibiotic-resistant bacteria

• Better sanitation

What is the major cause of acid rain?

• 
  Sulfur dioxide and nitrogen oxides

• 
  Ozone

• Carbon dioxide

• Deforestation

What is eutrophication caused by?

• 
  The greenhouse effect

• 
  Excess fertilisers running off agricultural land into waterways

• 
  Smog

• Burning fossil fuels

What process occurs very slowly in peat bogs?

• Respiration

• 
  Photosynthesis

• 
  Decomposition

• Combustion

What are peat bogs an important store of?

• Carbon

• Nitrogen

• Water

• Algae

Which of these is not a consequence of global warming?

• 
  More tropical diseases

• 
  Lowering of sea levels

• 
  Extinctions

• Changes in weather patterns

What is conservation?

• 
  Cutting down of trees

• 
  Rapid growth of algae as a result of fertilisers

• The preservation of ecosystems

• Making jam

Which of these is NOT a way of increasing biodiversity?

• 
  Deforestation

• Breeding programmes

• Planting hedgerows

• Recycling resources