B3.4

Question 1

What do humans often upset

Answer 1

The balance of different populations in natural ecosystems, or change the environment so that some species find it difficult to survive

Question 2

What is a problem due to so many people in the world

Answer 2

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

Question 3

What do humans rely on the ecosystem for

Answer 3

Water
Food
Shelter

Question 4

What has a rapid growth in human population and higher living standard lead to

Answer 4

More waste produced

Question 5

What needs to happen to waste to stop pollution

Answer 5

Waste needs to be handled properly

Question 6

What does waste pollute

Answer 6

Water- sewage, fertilisers or chemicals

Air- smoke and gases e.g sulphur dioxide

Land-pesticides and herbicides which pollute the waterway

Question 7

How do humans reduce the amount of land available for other animals and plants

Answer 7

Building
Quarrying
Farming
Dumping waste

Question 8

What has deforestation caused

Answer 8

Increased C02 emissions

Less trees to remove the C02

Less biodiversity

Question 9

Why has deforestation occured

Answer 9

More crops for biofuels

Increase in cattle and rice fields

Quarrying

Question 10

What has the destruction of peat bogs and other areas of peat released

Answer 10

Carbon dioxide into the atmosphere

Question 11

What has carbon dioxide and methane contributed to

Answer 11

Global warming

Question 12

What can an increase in the earths temperature of only a few degrees celsius cause

Answer 12

Big changes in the earths climate

Rise in sea levels

Reduce diversity

Changes in migration patterns

Changes in the distribution of species

Question 13

What other than plants can remove C02 out the atmosphere

Answer 13

Oceans
Lakes
Ponds

Question 14

How are biofuels made

Answer 14

Fermentation from natural products

Question 15

How can biogas and mainly methane produced

Answer 15

By anaerobic fermentation of a wide range of plant products or waste materials containing carbohydrates

Question 16

What happens at each stage in a food chain

Answer 16

Less material and less energy are contained in the biomass of the organisms

Question 17

How can the efficiency of food production be improcved

Answer 17

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

Question 18

What are fish stocks in the ocean doing

Answer 18

Declining

Question 19

Why is it important to maintain fish stocks at a levels where breeding continues

Answer 19

Certain species may disappear altogether in some areas

Question 20

How can we conserve fish stocks

Answer 20

Lowering net size

Fishing quotas

Question 21

Why is the fungus fusarium important

Answer 21

Because it is useful for producing mycoprotein, for vegetarians

Question 22

What is mycoprotein

Answer 22

A protein rich food suitable for vegetarians

Question 23

How is the fungus fusarium made

Answer 23

Grown on glucose syrup in anaerobic conditions and the biomass is harvested and purified