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
What term describes the graph of World human population increase?
Normal distribution
Exponential
Linear
Which of these is not a reason for an increase in human population?
Better health care
Intensive farming
Antibiotic-resistant bacteria
What is the major cause of acid rain?
Sulfur dioxide and nitrogen oxides
Ozone
Carbon dioxide
What is eutrophication caused by?
The greenhouse effect
Excess fertilisers
Smog
What process occurs very slowly in peat bogs?
Respiration
Photosynthesis
Decomposition
What are peat bogs an important store of?
Carbon
Nitrogen
Water
Which of these is not a threat of global warming?
More tropical diseases
Lowering of sea levels
Extinctions
What is conservation?
Cutting down of trees
Rapid growth of algae as a result of fertilisers
The preservation of ecosystems
Which of these is NOT a way of increasing biodiversity?
Deforestation
Recycling
Planting hedgerows