5.2 & 5.3 Flashcards
Define dendrology
Calculating the age of a tree using tree rings
What does the thickness of tree rings depend on
The climate
What can temperature levels be compared with
Co2 levels
What does pollen analysis allow
Allows analysis of plants from the past
Gain ideas of climate conditions
Define extrapolating
Continuing the current trend shown into the future or past
What does extrapolating assume
Current trend will continue
What is NPP
The amount of energy stored as biomass
What are four examples of greenhouse gases
CO2
CH4
CFCs
Water vapour
What do greenhouse gases do
Absorb infrared radiation in the atmosphere
Therefore less in emitted
Trapping heat
Increasing temperature of earths surface
What are the two main effects of global warming
Increased temp of earths surface
Rising sea levels: melting of ice
Explain what is meant by the term global warming
Increase in greenhouse gases in the atmosphere
Such as CO2
Greenhouse gases absorb infrared radiation
Increased greenhouse effect
Causes a rise in temp of earth surface
What other factors contribute to global warming
Degree of reflection from ice and snow
Extent of cloud cover
Changes in Suns radiation
How does temp affect enzyme activity
Enzymes have an active site complementary to the substrate
Enzymes have an optimum temp
When temp over optimum, some enzymes begin to denature
Reduced enzyme activity and number of enzyme-substrate complexes formed
