Week 9: Energy Flows. Chapter 14. WEEK 9: Energy Flows. LEARNING OUTCOMES By the end of this week, you should: Be able to describe the ways in which energy flows through ecosystems. Recognise that matter cycles within ecosystems.
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Week 9: Energy Flows
By the end of this week, you should:
Discuss a definition for these 8 words with the person next to you.
Check your understanding by choosing the correct definition from the next slide.
Complete Quick-check questions on page 446 – Nature of Biology
How do we lose energy to the environment?
What is the effect of maintaining a constant body temperature?
The rule of thumb: the useful chemical energy leaving one trophic level is typically only 10% of the energy entering that level.
body temperaturebiomass plants
respiration energy movement food chain
Food Chains and Webs
Where does the energy originate from?
What happens to this energy as you go through the food chain?
What do the arrows represent?
Where is energy lost?
Complete the Quick-check questions – page 452
Numbers, Biomass, Energy
An oak tree is very large so many insects can feed on it.
Fleas are very small and lots of them can feed on a rabbit.
stinging nettles caterpillars robin
marine plants small fish large fish seals polar bear
Complete Quick-check questions page 454
Complete the worksheet
The Carbon Cycle
The Nitrogen Cycle
The Water Cycle
Complete the Quick-check questions on page 467
Complete the poster task on biochemical cycles
Green plants use carbon dioxide in photosynthesis
Combustion removes carbon from the atmosphere
False – combustion releases carbon dioxide gas
The largest store of carbon is the atmosphere
False – more is found in marine organisms and limestone rock deposits
Respiration adds carbon dioxide to the atmosphere
Respiration only occurs in animals
False – both animals and plants respire
Decomposers remove carbon dioxide from the atmosphere
False – they respire and release carbon dioxide
Fossil fuels represent a huge (but decreasing) store of carbon
Increasing carbon dioxide may cool the Earth down
False – scientists think it will cause global warming
Energy is transferred from plants to animals to decomposers
Respiration releases energy to the environment in the form of heat