B3.4 Humans And Their Enviroment Flashcards

(30 cards)

0
Q

What are the issues with population increase?

A

More land use
More demand for resources
More pollution
More waste

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1
Q

Why is the population increasing?

A

Infrastructure is improving
More children
Live longer
Better health care

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2
Q

Why is there increase land use?

A
More people
Food
Mining
Quarrying
Landfills
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3
Q

Why is there more resource demand?

A

Higher standard of living eg. Cars, technology, more hygiene
Fossil fuels being used

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4
Q

What does more waste do?

A

More landfills
More sewage
Toxic chemicals
Damages food chains

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5
Q

What’s bioaccumulation?

A

Small amounts if chemicals in water, along the food chain more is present so could be harmful

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6
Q

What can air pollution cause?

A

Acid rain
( they now collect it and make plaster board which is calcium sulphate)
Global dimming- particulates from burning

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7
Q

Why does deforestation and peat destruction increase carbon dioxide levels?

A

Burning releases CO2
Less plants and they photosynthesise
Dead vegetation decays

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8
Q

What can produce methane?

A

Cattle

Micro organisms in rice fields

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9
Q

What happens when peat bogs are destroyed?

A

They are huge carbon sinks
Burned
CO2 released
Sold as fertiliser

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10
Q

What are the effects of global warming?

A
Climate change
Rising sea levels
Reduced diversity
Changes in migration
Changes in distribution
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11
Q

When is ethanol made?

A

Fermentation

When micro organisms respire in anaerobic conditions

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12
Q

Pro’s of biofuels?

A
Renewable
Carbon neutral
Sustainable
Lower fuel price
Good in rural areas
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13
Q

Con’s of biofuels?

A
Uses land
Low yield
Flammable
Hard to store
No infrastructure
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14
Q

Where’s biogas from?

A

When micro organisms decompose dead plants or animal waste

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15
Q

What’s biogas ?

A

Flammable gases

Mainly methane

16
Q

Uses of biogas?

A

Cooking, heating, electricity

17
Q

How is biogas made?

A

In anaerobic digestion
At 30 degrees
Manure in make bubbles and the gas collected is biogas

18
Q

Why is biogas boos for poor countries?

A
From cow poo
Cheap
Simple
Sustainable
Slurry can be used on crop as fertiliser
19
Q

Why does biomass decrease along the food chain?

A
Lost in:
Respiration
Movement
Growth
Excretion 
Making new tissue
20
Q

Is it more efficient to make food from plants or animals?

21
Q

How can you reduce energy loss of food?

A

Stop animals moving

Keep warm surroundings

22
Q

Problems with animals in cramps conditions?

A

Heating costs
More distress so more drugs which may affect the food
Cost more for medicine care

23
Q

Problems with free range animals?

A

Expensive
More muscles
Use more energy

24
Why has fishing increased?
Population increase Better technology Staple part of the diet
25
How are fish protected?
Larger holes in fishing nets Banning fishing in breeding season Protective breaking grounds Prosecution of people who overfish Total amount of fish allowed to be caught a year Monitor fish boats so they don't cross into another countries waters
26
What's mycoprotein?
Protein from fungus (fusarium)
27
Where is fusarium from?
Grown in glucose syrup | Then it's harvested and purified
28
What are the good things are mycoproteins?
Can be different textures and flavours Low in fat Cheap to make Vegetarian
29
How are mycoproteins made?
In a machine Motor mixes it Fungus respire aerobically Tap at the bottom to collect the protein