T7 biodiversity and the effect of human interaction on ecosystems Flashcards Preview

aqa gcse biology free > T7 biodiversity and the effect of human interaction on ecosystems > Flashcards

Flashcards in T7 biodiversity and the effect of human interaction on ecosystems Deck (18)
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1
Q

what is biodiversity

A

variety of the different species on earth or within an ecosystem

2
Q

what is the importance of biodiversity

A

maintain the stability of an ecosystem

3
Q

how does biodiversity ensure the stability of an ecosystem

A

reduces the dependence on particular species for resources so that even if one species is removed other species can still survive

4
Q

why have human consumption of resources and waste production increased

A

rapid rise in human population

increase in standard of living

5
Q

state an example of water pollutants

A

sewage
fertiliser
chemicals

6
Q

how does eutrophication occur

A

fertiliser from farms pollute the water, causing excessive algae growth, depleting the oxygen in the water, causing other plants and animals to die

dead plants are decomposed by bacteria and the oxygen level decreases further

7
Q

examples of air pollutants

A

smoke

acidic gases

8
Q

examples of land pollutants

A

landfill waste

chemicals

9
Q

what human activities reduce the land available for animals and plants

A

building
farming
quarrying
disposing of waste

10
Q

why have peat bogs been destroyed

A

produce compost to increase food production

11
Q

why does the destruction of peat bogs greatly contribute to the greenhouse effect

A

peat bogs are stores of carbon and burning them releases a large volume of CO2 into the atmosphere

12
Q

why have large-scale deforestation activities occured

A

provide land for cattle or rice fields

grow crops to produce biofuels

13
Q

what is the greenhouse effect

A

greenhouse gases trap energy from the sun as heat in the atmosphere, keeping the temperature on earth suitable for life

14
Q

what is causing global warming

A

increase in levels of greenhouse gases causing the temperature on earth to increase

15
Q

harmful effects of deforestation

A

destruction of many animals habitats

releases large amounts of greenhouse gases

16
Q

state the consequences of global warming

A

rising sea levels

melting polar ice caps

changing weather patterns

migration to find suitable habitats

tropical diseases becoming common

extinction of species

17
Q

describe the steps taken to maintain biodiversity

A

breeding programmes

protection and rebuilding habitats

replanting field margins and hedgerows

reduce deforestation

reduce carbon dioxide emissions

recycling rather than disposing in landfills

18
Q

purpose of replanting hedgerows and field margins

A

higher biodiversity in the margins than the fields that they surround