The Environment

Question 1

Effects of deforestation

Answer 1

Leaching
Soil Erosion
Disturbance of the water cycle
disturbance of the balance in atomspheric oxygen and carbon dioxide

Question 2

Examples of Greenhouse Gases

Answer 2

Water vapour
carbon dioxide
nitrous oxide
methane
CFCs

Question 3

The biological consequences of pollution of air by sulfur dioxide and carbon

Answer 3

Sulfur dioxide dissolves in rain water to form a mixture of acids. The rain water becomes more acidic with a much lower pH.
Carbon monoxide is a dangerous pollutant, can also cause death to humans.

Question 4

an increase in greenhouse gases results in…

Answer 4

an enhanced greenhouse effect and that may lead to global warming:
polar ice caps melting and sea levels rising
a change in the major ocean currents
a change in global rainfall patterns

Question 5

How do human activities contribute to greenhouse gases?

Answer 5

We burn more fossil fuels (eg. petrol)
cutting down large areas of vegetation, specifically the tropical rainforest because they absorb so much carbon dioxide.
we pollute the air with many gases (eg carbon dioxide, carbon monoxide, sulfur dioxide, methane etc.)

Question 6

the use of fertiliser

Answer 6

organic or inorganic
many organic fertlisers are made from faeces of animals mixed with hay
inorganic fertilisers are compounds like potassium nitrate or ammounium nitrate

USED TO INCREASE CROP YIELD

Question 7

Eutrophication can result from…

Answer 7

leached minerals from fertiliser

Question 8

The water cycle

Answer 8

Evaporation - water from surfaces of oceans, lakes, rivers.
Condensation - clouds rise over mountains they cool and water condenses to form rain or snow.
Precipitation - falls on earth where taken up by animals or plants or enters rivers and flows to sea to start again.

Question 9

The biological consequences of pollution of water by sewage

Answer 9

Increase in number of organisms therefore depletion of oxygen

Question 10

The process of eutrophication (8)

Answer 10

• Nitrate levels increase resulting in massive algae growth
• Algae forms a algae bloom
• Algae prevents any sunlight penetrating into the water
• Plants die as they can’t photosynthesise
• Algae die a they run out of nitrates
• Bacteria decay dead matter
• Bacteria reproduce and use oxygen
• The water becomes anoxic and nothing can live in it