ch17 Biodiversity and ecosystems Revision -PMH

Peat bogs are made by __________ that did not decay completely. what word fills in the gap?

• animal waste

• coal

• plant material

• dead animals

what is Biodiversity?

• a measure of how many species live in an ecosystem

• all organisms in a food web depend on each other

• all food webs in a habitat combined

what term describes the graph of the human population growth?

• normal distribution

• exponential

• linear

what process occurs very slowly in peat bogs?

• photosynthesis

• respiration

• decay

what are peat bogs an important store of?

• carbon

• nitrogen

• water

• methane

which of these is not a threat of global warming?

• more tropical diseases

• lowering of sea level

• extinctions

which of these is NOT a way of increasing biodiversity

• deforestation

• recycling

• planting hedgerows

why is deforestation a problem?

• more carbon dioxide is absorbed from the atmosphere

• less carbon dioxide is 'locked up' in wood

• there is a dangerous increase in biodiveristy

which one of these is NOT a green house gas

• methane

• carbon dioxide

• water vapour

• nitrogen oxide

which of these is NOT a reason for deforestation?

• To improve the quality of the soil

• to grow crops for food (eg palm oil)

• to rear cattle

• to grow crops for biofuels (eg sugar cane)