Human Population And Pollution

Question 0

What is the effect of eutrophication?

Answer 0

Fertilisers stimulate rapid growth of algae. Competition for light increases so plants die. Microorganisms feed on dead plants. Respiration by increased amounts of microorganisms lowers O2 levels. Aerobic organisms die due to lack of oxygen. Water can no longer support life.

Question 1

Why does building houses for humans affect animals and plants?

Answer 1

Land has to be cleared, which destroys their habitats

Question 2

Which gas is the main cause for acid rain?

Answer 2

Sulphur dioxide

Question 3

Explain how birds are affected by acid rain

Answer 3

Damage to trees and plants means birds lose food and habitats

Question 4

Which process in plants and algae removes CO2 from the air?

Answer 4

Photosynthesis

Question 5

Give some negative effects of deforestation

Answer 5

Increased the release of CO2, due to burning of the trees or decay of the wood by microorganisms.
Reduced rate at which CO2 is removed .
Reduced biodiversity due to loss of food and habitats

Question 6

Which process causes the release of carbon dioxide from peat?

Answer 6

Respiration during decay by microorganisms

Question 7

How is carbon dioxide sequestered?

Answer 7

CO2 is removed from air by plants in photosynthesis and by dissolving in oceans, rivers and lakes

Question 8

Why might sea levels rise in the future?

Answer 8

If the climate gets warmer, the ice will melt

Question 9

Why is it difficult to prove that human activities have caused climate change?

Answer 9

The climate has changed anyway, even before humans evolved