IGCSE 0610 21 Human influences on ecosystems

Carbon dioxide is a greenhouse gas.

Name one other greenhouse gas

• A

• B

• C

• D

There can be a shortage of water in highly-developed countries where water use is very high.

Some water is used to flush waste from domestic toilets.

Choose all of the reasons why this water must be treated before it can be reused

• To remove any harmful pathogens from sewage

• To stop the water running out

• To reduce the pH of the water

• To remove harmful chemicals from the sewage

• To remove the floating poos from the sewage

Sulfur dioxide (SO₂) can cause acid rain.

Name one other pollutant that can cause acid rain

• A

• B

• C

• D

A pollutant causes a plant to lose its green colour.

How will this pollutant affect plants of this type over long period of time?

• colourless mutants will survive

• larger leaves will be produced

• there will be no long-lasting effects

• this type of plant will not survive

• 0 km

• 3 km

• 10 km

• 14 km

What is the name of the effect which is enhanced by increasing carbon dioxide and methane concentrations in the atmosphere?

State a possible cause of an increase in carbon dioxide concentrations in the atmosphere.

Select all the adverse effects of increased carbon dioxide levels in the atmosphere

• increased sea levels

• enhanced greenhouse effect

• increased species globally

• increased flooding

• increased habitats