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The increased concentration of which two gases in the atmosphere causes the greenhouse effect?
How is methane produced by microbes?
As a product of anaerobic respiration
Give two significant producers of methane?
- The intestines of cattle
- Waterlogged rice fields
Describe the changes to radiation of UV rays caused by greenhouse gases
- The UV rays from the sun are radiated back into space from the surface of the earth
- The greenhouse gases absorb the heat energy from these rays
- The energy is then re-radiated back to the Earth's surface
What does the re-radiation of UV rays cause?
Gradual warming of the Earth's surface (Global Warming)
What benefits will global warming have on crops and why?
The rates of light independent reactions will increase due to increased enzyme activity as a result of an increase in kinetic energy
Why will global warming reduce productivity of crops?
- Rates of respiration will be increased
- More glucose will be broken down during the glycolysis stage
- Less glucose is converted to glycogen to be stored meaning less growth occurs
Give three reasons that global warming may cause plant death
- Temperatures denaturing enzymes
- Increased evaporation of water
- Rising sea levels flooding areas with salty water
How may a rise in temperature benefit crops in some areas
- A rise in temperature in an area previously too cool to support a high yield of crops due to enzyme inactivity would increase yield
- All plants benefit from higher carbon dioxide levels
How may temperate rise cause an increase in the number of insect pests?
More insects and their larvae will survive winterMore will be present in the following year laying more eggs
How may the distribution of Xerophytes change due to rising temperatures?
Areas that become prone to drought would have increased numbers of these plant species
How may the distribution of halophytes change as a result of rising temperatures?
Areas flooded with sea water would be colonised by halophytes
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