Humans And The Environment

Question 0

Deforestation affects

Answer 0

Minerals leach out of the bare soil
Soil is eroded
Water cycle disturbed- lack of transpiration front he trees
Balance of carbon dioxide and oxygen affected
Carbon dioxide builds up and less oxygen is made

Question 1

Deforestation

Answer 1

Cutting down large areas of forest
Leaves the soil exposed
Trees burnt

Question 2

Burning trees affects

Answer 2

Uses up more oxygen

Produces more carbon dioxide

Question 3

Water pollution comes from

Answer 3

Nitrates (fertilisers)
Sewage
Detergents

Question 4

Eutrophication made by

Answer 4

Nitrates leaching out of fertilisers into water
Nitrate levels rise
Increase in algae growth
Blocks light from water plants
Water plants die
Algae die when nitrates run out
Decomposers break down dead plants and algae using up oxygen
Oxygen levels in the water fall
All animals in the pond die

Question 5

Sulfur dioxide produced by

Answer 5

After burning fossil fuels

Question 6

Sulfur dioxides effect

Answer 6

Combines with rainwater and forms sulfuric acid (acid rain)
Damages plants
Kills fish
Damages buildings

Question 7

Carbon monoxide produced by

Answer 7

Burdening fuels without enough oxygen

Question 8

Carbon monoxide’s effect

Answer 8

Combines with haemoglobin in the blood

Can kill if the blood doesn’t carry enough oxygen

Question 9

Greenhouse gases

Answer 9

Carbon dioxide, water vapour, nitrous oxide, methane, CFC’s
Trap heat
Human activities increase these
Alter the environment

Question 10

Fish farming

Answer 10

Fish are kept in large enclosures
Water quality controlled by monitors
Only one species of fish per enclosure
Selective breeding is used to produce fast growing fish

Question 11

Problems of fish farming

Answer 11

Disease can spread quickly
Waste from the fish and excess food can cause water pollution
Wild fish stock are being depleted to make pellets to feed the farmed fish

Question 12

Greenhouse and polythene tunnels

Answer 12

Increase the rate of photosynthesis (by warming up the area)
Thus increasing crop yields
The carbon dioxide in the air can also be controlled

Question 13

Fertilisers bad effect

Answer 13

Return nitrates and other minerals to the soil

Question 14

Pesticides bad effect

Answer 14

Sprayed on crops to kill pests
Can cause environmental damage
Kill useful animals (pollinating ones) and the pests predators