biogas generators

Question 1

Describe how biogas generators work

Answer 1

Biogas generators provide methane gas
for fuel through anaerobic decomposition
that occurs in animal waste

Question 2

Describe how environmental conditions

affect communities

Answer 2

● Environmental conditions e.g. temperature, soil pH, light intensity affect the abundance and distribution of organisms within communities.
● e.g rising global temperatures have been linked to the extinction of frog species (their thin skin makes them more vulnerable to temperature changes).

Question 3

How can different temperatures be bad

for certain communities?

Answer 3

• If the temperature is too low, growth will be slower as organisms will use more energy to stay warm
• If the temperature is too high, organisms can die and water will become limited as evaporation increases

Question 4

How can changes in water levels affect

ecosystems?

Answer 4

• Animals may have to migrate to find water.
• Melting ice caps may destroy the habitats of some animals (either animals living in icy
  regions or by sea level rise).

Question 5

How can atmospheric gases affect

ecosystems?

Answer 5

• Some organisms cannot survive when
  certain gases are present.
• Polluted water can cause illness to
  animals that drink it.

Question 6

What detrimental impacts can sulfur

dioxide have on the environment?

Answer 6

• Formed when fossil fuels containing
  impurities are burnt.
• Sulfur dioxide can dissolve in water to form acid rain which can erode buildings and pollute water sources.

Question 7

What detrimental impacts can carbon

monoxide have on the environment?

Answer 7

• Carbon monoxide is formed from the incomplete combustion of fossil fuels.
• Carbon monoxide binds irreversibly to haemoglobin which prevents it from carrying oxygen.
• Too much exposure can cause unconsciousness and death.

Question 8

Give 3 human activities that contribute to

greenhouse gases

Answer 8

• Burning fossil fuels
• Deforestation
• Large scale livestock farming

Question 9

How do greenhouse gases lead to global

warming?

Answer 9

• Greenhouse gases allow heat from the
  sun to enter the atmosphere.
• The gases act as a ‘blanket’ and trap
  the heat in the atmosphere.

Question 10

State 3 negative consequences of global

warming

Answer 10

• Sea level rise caused by melting icebergs.
• Disrupted farming and agriculture.
• Increased spread of diseases in warmer
  climates.