B3.4 Flashcards
What do humans often upset
The balance of different populations in natural ecosystems, or change the environment so that some species find it difficult to survive
What is a problem due to so many people in the world
There is a serious danger of causing permanent damage not just to the local environment but also to the global environment unless our overall effect is managed carefully
What do humans rely on the ecosystem for
Water
Food
Shelter
What has a rapid growth in human population and higher living standard lead to
More waste produced
What needs to happen to waste to stop pollution
Waste needs to be handled properly
What does waste pollute
Water- sewage, fertilisers or chemicals
Air- smoke and gases e.g sulphur dioxide
Land-pesticides and herbicides which pollute the waterway
How do humans reduce the amount of land available for other animals and plants
Building
Quarrying
Farming
Dumping waste
What has deforestation caused
Increased C02 emissions
Less trees to remove the C02
Less biodiversity
Why has deforestation occured
More crops for biofuels
Increase in cattle and rice fields
Quarrying
What has the destruction of peat bogs and other areas of peat released
Carbon dioxide into the atmosphere
What has carbon dioxide and methane contributed to
Global warming
What can an increase in the earths temperature of only a few degrees celsius cause
Big changes in the earths climate
Rise in sea levels
Reduce diversity
Changes in migration patterns
Changes in the distribution of species
What other than plants can remove C02 out the atmosphere
Oceans
Lakes
Ponds
How are biofuels made
Fermentation from natural products
How can biogas and mainly methane produced
By anaerobic fermentation of a wide range of plant products or waste materials containing carbohydrates
What happens at each stage in a food chain
Less material and less energy are contained in the biomass of the organisms
How can the efficiency of food production be improcved
By reducing the number of stages in food chains
Restricting energy loss from food animals by limiting their movement and by controlling the temperature of their surroundings
What are fish stocks in the ocean doing
Declining
Why is it important to maintain fish stocks at a levels where breeding continues
Certain species may disappear altogether in some areas
How can we conserve fish stocks
Lowering net size
Fishing quotas
Why is the fungus fusarium important
Because it is useful for producing mycoprotein, for vegetarians
What is mycoprotein
A protein rich food suitable for vegetarians
How is the fungus fusarium made
Grown on glucose syrup in anaerobic conditions and the biomass is harvested and purified
