3.4 Humans And Their Environment Flashcards Preview

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Flashcards in 3.4 Humans And Their Environment Deck (31)
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1

What does rapid growth and increased standard of living lead to?

More waste produced

2

What does waste lead to?

Pollution

3

What can be polluted and by what?

Water - with sewage, fertiliser or toxic chemicals
Air - with smoke and gases
Land - with toxic chemicals

4

Which gas pollutes the air and what can it do?

Sulfur dioxide
Causes acid rain
Kills organisms
Trees can be damaged if exposed for long periods of time
Change the pH of the soil

5

Which toxic chemicals can pollute the land?

Pesticides and herbicides

6

Why do humans deforest, reducing land for animals and plants?

Building
Farming
Quarrying
Dumping waste

7

What is large scale deforestation in tropical areas used for?

Need for timber
Provides land for agriculture

8

What does deforestation lead to?

Increased release of CO2
Reduced rate at which CO2 is removed by photosynthesis
Reduced biodiversity due to loss of food and habitats

9

What produces methane?

Cattle and rice fields

10

What are peat bogs?

Areas where plants don't fully decompose upon death
A store of locked up carbon

11

What is peat used in?

Compost in agriculture to improve the nutrient content of soil

12

What happens when peat bogs are destroyed?

They release CO2

13

What should be encouraged?

Using 'Peat free' compost

14

How does global warming happen?

The gases CO2 and methane help re-radiate energy back to earth

15

What can global warming cause?

Changes in the earths climate
Rise in sea level
Reduce biodiversity
Changes in migration patterns of birds
Changes in distribution of species

16

How is CO2 removed?

It can be sequestered in oceans, lakes and ponds

17

How can biofuels be made?

From natural products by fermentation

18

What is the main biogas?

Methane

19

How can methane be produced?

Anaerobic fermentation of plants products or waste material containing carbohydrates

20

Where can the waste used in anaerobic fermentation come from?

Industrial: sugar factories and sewage works

Organic: waste of plants and animal faeces

21

Where is the output of biogas higher?

Warmer countries

22

What are the advantages of biogas?

Useful to recycle waste material
Fuel is readily available
Waste is used in fertilisers (called slurry)
Reduces use of fossil fuels
Raw materials are cheap

23

What happens the more stages in a food chain there are?

Less energy and less biomass the organism contains

24

How can efficiency of food production be improved?

Reducing the number of stages in a food chain
Restricting movement
Controlling the temperature of the surroundings
Give the preemptive antibiotics

25

What are happening to fish stocks?

They are declining

26

What rules are fishermen under when fishing?

They can only remove a strict allocation per year
They use certain sized nets to avoid catching smaller young fish

27

What fungus is used to create meat substitutes?

Fusarium

28

Why is Fusarium grown?

To produce Mycoproteins

29

Where is the fungus grown?

On glucose syrup (waste starch) in aerobic conditions and the biomass is harvested and purified

30

How can producing Mycoproteins be produced on a large scale?

In industrial fermenters