learning objectives: that microorganisms have an important role in decay that microorganisms have...
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Learning Objectives:• That microorganisms have an important role in decay• That microorganisms have potential benefits to the environment.• Investigate how microorganisms can break down waste, clean up pollution and help produce bio-fuels
‘ What are microbes useful for?’
As a class, write down as manyideas as possible on this slide . No judgement are to be made About the answers given until all ideas from the class are in
and discussions take place
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What goes into your compost?Banana peelings
Egg shells
Tea bags
Potato peeling
s
Old vegetabl
es
Garden waste
How microorganisms are involved in decay
This type of waste is biodegradable which means it can be broken down into simpler substances by decomposing microbes and other life forms such as worms.
Microbes carry out respiration and so get their energy from this waste. They need this energy to grow, the by-product is compost.
Compost is great for the garden as it provides the soil with essential nutrients and improves the structure of the soil.
Composting reduces the amount of waste put into landfill sites.
Kitchen and garden waste buried in landfill sites cannot rot properly due to the lack of Oxygen.
The site will start to smell and due to the anaerobic conditions that develop, a mixture of microbes break down the organic matter giving off methane and carbon dioxide. Methane is a greenhouse gas that contributes to global warming
How microorganisms contribute to the breakdown of waste
All that goes down your
toilet normally ends up at a
sewage works
Firstly, sewage is sieved to get
rid of solid items like
toothbrushes! It is then sent to
aeration tanks
It then sinks to the bottom and
forms a ‘soup’ at the top
Air is bubbled in and the
good bacteria multiply
digesting the harmful bacteria
The sludge left at the bottom is
heated up…
Hmmm… why is it that plastic bags take so long to break down? If it is
bacteria that break down the bag, why is it we can’t isolate the bacteria and
encourage them to grow in larger quantities?
That’s a good point! Discuss with your
partner what you think would be needed for
the bacteria to grow in large numbers.
It’s true! A 16 year old student came up with
the idea behind us plastic degrading microbes! He put
together some household items to
make a medium for the bacteria to grow in. After
tests to isolate the bacteria, he encouraged
us to multiply and provided us with strips of plastic bags to break down! It only took us 6
weeks!
I have discovered microbes that…
Can you come up with any ideas as to what might be important uses for microbes for the future?
Produce a leaflet or poster explaining the advantages and disadvantages of the use of microorganisms for bio-
fuels. Remember to use more than two sources of information to improve the reliability of your
work
Discuss with your partner:
• That microorganisms have an important role in decay…
• That microorganisms have potential benefits to the environment…
• That microorganisms can break down waste, clean up pollution and can help produce biofuels…
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