GCSE · Biology · AQA · Spec 8461

Waste management and pollution

More people, each using more. So where does all the extra waste go, and why should plants and animals care?

Build the web

How more people can mean less biodiversity

Start with two everyday pressures: there are more people, and living standards are rising, so people use more. Pick a factor, pick the factor you think it acts on, and add the arrow. Keep going until you've drawn every link you believe in, then compare your web with the lesson's. One tip: waste isn't the only factor with an arrow into pollution. Look for the one that acts alongside it.

Rapid growth in the human population
A rising standard of living
More resources used
More waste produced
Waste and chemicals not properly handled
More pollution
Plants and animals killed, so biodiversity can fall (outcome)

Add a link

This factor……made this happen or worse

No links yet.

UK note

AQA GCSE Biology 8461, section 4.7.3 (waste management). This is for both Foundation and Higher tier, and it is assessed on Paper 2.

Predict, then check

Two made-up towns, invented just for this question.

Town A and Town B throw away exactly the same amount of waste. Town A handles its waste and chemicals properly. Town B doesn't. Which town will cause more pollution?

Where does it end up?

Water, air or land?

Pollution can occur in water, in air and on land. For each source, tick every kind of pollution it's a source of. Watch out: one source belongs in two circles.

A Water pollution
B Air pollution
C Land pollution

Sewage
Fertiliser
Toxic chemicals
Smoke
Acidic gases
Landfill

The last link

What does 'reduce biodiversity' actually mean?

Pollution has killed some of the plants and animals living in an ecosystem.

Which idea is closest to what you think right now about how this affects biodiversity?

Biodiversity is the total number of organisms, so every plant or animal killed reduces it.Biodiversity means the different kinds of animals. Plants don't really count.Pollution kills plants and animals, so biodiversity always goes down.Biodiversity is the variety of all the different species. Killing plants and animals can reduce it if the ecosystem ends up with less variety of species.

How sure are you?

I'm sureI think soI'm guessing

Biodiversity is the total number of organisms, so every plant or animal killed reduces it.

This is a common misconception

This is the big one to fix. Biodiversity isn't a headcount. It's the variety of all the different species of organisms, on Earth or within an ecosystem. So the question isn't 'how many organisms died?' It's 'how many different species are still there?'

Biodiversity means the different kinds of animals. Plants don't really count.

This is a common misconception

Plants count too. Biodiversity is the variety of all the different species of organisms, so plants, animals and every other kind of organism are all part of it. That's why it matters that pollution kills plants as well as animals.

Pollution kills plants and animals, so biodiversity always goes down.

This is a common misconception

Close, but watch the word 'always'. Pollution kills plants and animals, and that CAN reduce biodiversity. Because biodiversity is about the variety of species, the thing to ask is whether that variety is lost. Keep the word 'can' in your answers.

Biodiversity is the variety of all the different species. Killing plants and animals can reduce it if the ecosystem ends up with less variety of species.

This matches the evidence

Spot on. Biodiversity is the variety of all the different species of organisms, on Earth or within an ecosystem. Pollution kills plants and animals, and that can reduce biodiversity. You've kept both the definition and the word 'can'.

Biodiversity means variety: all the different species of organisms, on Earth or within an ecosystem. Pollution kills plants and animals, which can reduce it.

Your turn to write

Write the whole chain

Describe how rapid growth in the human population can lead to a reduction in biodiversity. [4 marks]

Your answer

0 words · your answer stays on this page and is not sent anywhere.

The mark scheme

More resources are used and more waste is produced. (1 mark)
Unless waste and chemicals are properly handled, more pollution is caused. (1 mark)
Pollution can occur in water, air or on land, with a named source such as sewage, smoke or landfill. (1 mark)
Pollution kills plants and animals, which can reduce biodiversity. (1 mark)

Model answer

As the population grows, more resources are used and more waste is produced. If that waste and the chemicals aren't properly handled, more pollution is caused. The pollution can be in water from sewage, in the air from smoke, or on land from landfill. Pollution kills plants and animals, and this can reduce biodiversity.

Four links, in order: more resources and waste, then poor handling causes pollution, then pollution in water, air or land, then plants and animals killed so biodiversity can fall. Skip a link and the chain breaks.

WHAT YOU'VE LEARNED

A quick recap of today's lesson.

Whether that waste becomes pollution, and whether plants and animals pay the price, comes down to one small word: unless.

What you need to know

Rapid growth in the human population and a rising standard of living mean more resources are used and more waste is produced.
Unless waste and chemicals are properly handled, more pollution is caused.
Water pollution can come from sewage, fertiliser or toxic chemicals.
Air pollution can come from smoke and acidic gases.
Land pollution can come from landfill and toxic chemicals.
Pollution kills plants and animals, which can reduce biodiversity. Biodiversity is the variety of all the different species of organisms on Earth, or within an ecosystem.

The big picture

Rapid growth in the human population and a rising standard of living both mean more resources are used and more waste is produced. Unless waste and chemicals are properly handled, more pollution is caused. Pollution can occur in water (from sewage, fertiliser or toxic chemicals), in air (from smoke and acidic gases) and on land (from landfill and toxic chemicals). Pollution kills plants and animals, which can reduce biodiversity: the variety of all the different species of organisms on Earth or within an ecosystem.

Key points

1It's a web, not a line: two separate pressures, more people and higher living standards, both feed more resource use and more waste.

2Handling is the condition. More waste isn't automatically more pollution: waste and chemicals that aren't properly handled cause more pollution.

3Toxic chemicals are the source named for two places: water and land.

4Biodiversity counts variety, not numbers, so write that pollution 'can' reduce it.

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Worked example

Problem

A student writes: 'The population is growing fast, so more waste is made, so biodiversity is reduced.' Find what's missing or wrong, and write a better version.

⚠ Watch out

Writing that more waste automatically means more pollution, or that biodiversity is the number of organisms. More pollution is caused unless waste and chemicals are properly handled, and biodiversity is the variety of different species.

🧠

Memory hook

More people, more stuff, more waste, and 'unless' decides if it's pollution. Toxic chemicals are the double agent: water AND land.

✓

Check yourself

Cover the page and redraw the web: the two starting pressures, the factor that acts alongside waste, and the ending. Then say which pollution source belongs in two places.

Flashcards

(10)

Which two changes mean that more resources are used and more waste is produced?

Rapid growth in the human population, and a rising standard of living.

When does waste lead to more pollution?

Unless waste and chemicals are properly handled, more pollution is caused.

In which three places can pollution occur?

In water, in air and on land.

Name three sources of water pollution.

Sewage, fertiliser and toxic chemicals.

Name two sources of air pollution.

Smoke and acidic gases.

Name two sources of land pollution.

Landfill and toxic chemicals.

Which pollution source is named for both water and land?

Toxic chemicals.

How can pollution reduce biodiversity?

Pollution kills plants and animals, which can reduce biodiversity.

What is biodiversity?

The variety of all the different species of organisms on Earth, or within an ecosystem.

Is biodiversity the total number of organisms in an ecosystem?

No. It's the variety of different species, not how many individual organisms there are.

Tap any card to flip it, or use Study as deck to go through them one at a time. In the full lesson these run as a spaced-repetition deck — you rate each card Hard, Good or Easy and the tricky ones keep coming back until they stick.

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How more people can mean less biodiversity

Water, air or land?

What does 'reduce biodiversity' actually mean?

Write the whole chain

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