Micro-organisms

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Micro-organisms

• S1 Science
• Biology topic

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There are lots of different types of germs.
Germs are all around us.
Germs are bad for us.
What are germs?
If we wash our hands regularly, we wont have any
germs on them.
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Learning outcomes Success criteria
Understand what micro-organisms are. Define the term micro-organism. Name the three main types of micro-organism. Describe examples of places where you can find micro-organisms.
Define the term micro-organism. Name the three main types of micro-organism. Describe examples of places where you can find micro-organisms.
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Reading

• Link BBC Bitesize (p2-4)

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Germs in your home

• Toilet
• Rubbish bins
• Front door/backdoor mat
• Vacuum/cleaner
• Clothes/Dish towels
• Soap dispensers/taps
• Tomato/brown sauce bottles
• House/mobile phones
• Work surfaces

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Experiment

• AIM to investigate where micro-organisms are
  found in the classroom.

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Where are these micro-organisms?

1. Label plate with you and your partners initials
   and the date.
2. Dip cotton bud in tap water.
3. Wipe test area with same bud.
4. Gently rub on your side of the plate.
5. Seal plates diametrically, small pieces!
6. Place in the tray upside down ready for incubation

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Learning outcomes Success criteria
Understand what micro-organisms are. Define the term micro-organism. Name the three main types of micro-organism. Describe examples of places where you can find micro-organisms.
Define the term micro-organism. Name the three main types of micro-organism. Describe examples of places where you can find micro-organisms.
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Useful and harmful micro-organisms

• S1 Science
• Biology topic

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Learning outcomes Success criteria
Know examples of situations where micro-organisms can be useful and harmful. Describe one examples of a situation where each of the three types of micro-organism can be useful. Describe one example of a situation where each of the three types of micro-organism can be harmful.
Describe one examples of a situation where each of the three types of micro-organism can be useful. Describe one example of a situation where each of the three types of micro-organism can be harmful.
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Factors affecting the growth of micro-organisms

• S1 Science
• Biology topic

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Learning outcomes Success criteria
Know factors which can affect the growth of micro-organisms. State three factors that are required for the growth of micro-organisms. State the effect of temperature on the growth of micro-organisms.
State three factors that are required for the growth of micro-organisms. State the effect of temperature on the growth of micro-organisms.
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Experiment
Key
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Bread
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Bread 10 drops water
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Bread 20 drops water
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• What is the AIM of the experiment?
• What is your HYPOTHESIS?
• Write a METHOD (with a labelled diagram)
• Leave space for RESULTS and a CONCLUSION.

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Results
Moisture content of bread (number of drops of water) Observations regarding growth of micro-organisms
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10
20
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Experiment
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• What is the AIM of the experiment?
• What is your HYPOTHESIS?
• Write a METHOD (with a labelled diagram)
• Leave space for RESULTS and a CONCLUSION.

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• What do you think would happen to the growth of
  micro-organisms if you kept on increasing the
  temperature?
• Sketch a graph to show the effect of temperature
  of the rate of growth of micro-organisms.

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Problem

• If a micro-organism reproduces once every 20
  minutes, how many micro-organisms will there be
  after
• 6 hours
• 2 days
• 3 weeks

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Learning outcomes Success criteria
Know factors which can affect the growth of micro-organisms. State three factors that are required for the growth of micro-organisms. State the effect of temperature on the growth of micro-organisms.
State three factors that are required for the growth of micro-organisms. State the effect of temperature on the growth of micro-organisms.
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Can micro-organisms be removed?

• S1 Science
• Biology topic

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Learning outcomes Success criteria
Know examples of situations where the growth of micro-organisms is related to personal hygiene and food safety. Describe one example of a situation where the growth of micro-organisms is related to personal hygiene and one for food safety, mentioning Where the micro-organisms have come from Their source of food The undesirable effect this can have
Know how micro-organisms can be removed. Describe three measures that could be taken to remove micro-organisms, putting these in an order of how effective each one is. Describe three examples of everyday situations where these steps are/should be put into practice.
Describe three measures that could be taken to remove micro-organisms, putting these in an order of how effective each one is. Describe three examples of everyday situations where these steps are/should be put into practice.
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Everyday situations involving micro-organisms

• Our bodies
• Food preparation surfaces
• Surgical equipment

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Deodorant vs antiperspirant
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Experiment
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