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Microorganisms
Bread acquires its texture from the action of microorganisms.

Microorganisms

Let's explore the world of tiny beings with this exciting KS2 Science topic - microorganisms! They're super small, like bacteria, viruses, and some fungi, and you need a special microscope to see them.

Did you know microorganisms are everywhere, even in a cow's tummy and our own guts? If we weighed them, they'd be heavier than all other living things! Some microorganisms can make us sick, but others are really helpful. How can we kill bacteria? Are viruses alive? And guess what, fungi help us make yummy bread!

Test your microorganism knowledge with this fun KS2 Science quiz. How much do you know about these tiny living wonders?

Join the Quiz Adventure! Read More About The Benefits
1.
Compost bins are full of rotting organic matter, such as vegetable peelings, mouldy fruit and grass clippings. Which microorganisms help this material to decompose (rot)?
Bacteria
Viruses
Algae
All of the above
Fungi also help with decomposition
2.
In order to see a microbe (a single microorganism), what would you need to use?
A telescope
A magnifying glass
A microscope
A pair of glasses
You can see colonies of microorganisms with the naked eye, but you would not be able to see a single microbe without a microscope
3.
Penicillin, yeast and mould are examples of what?
Fungi
Viruses
Bacteria
Algae
Fungi include single-celled microbes such as yeasts and moulds (including penicillium, which provides us with penicillin) as well as multicellular organisms such as mushrooms, which are not microorganisms
4.
Which doctor developed a vaccination for smallpox?
Alexander Fleming
Marie Curie
Louis Pasteur
Edward Jenner
It's been said that Jenner's work has saved more lives than that of anyone else
5.
What are antibiotics designed to fight?
Fungi
Viruses
Bacteria
All microorganisms
Antibiotics cannot kill viruses - this is why doctors do not prescribe them for colds (which are caused by viruses)
6.
Salmonella, E. Coli and Listeria: these causes of food poisoning are examples of what?
Fungi
Viruses
Bacteria
Amoebas
Not all bacteria are bad - our bodies use some kinds to help us digest food
7.
Which of the following statements is true?
Microbes are not living organisms
Some microorganisms are beneficial
All microorganisms are dangerous to humans
There are not very many types of microorganism
Some microorganisms are so beneficial that life would not be possible without them. The bacteria living on the roots of plants allow the plants to get the nitrogen they need from the soil - and remember, all life on Earth is dependent on plants
8.
Colds, influenza (flu) and chickenpox are caused by what?
Fungi
Viruses
Bacteria
Amoebas
Scientists are not agreed on whether viruses are even alive. Remember MRS. NERG? Viruses don't demonstrate all seven life processes. Viruses aren't sensitive (they don't respond to their environment) and they don't reproduce on their own (they take over another species' cells, causing them to reproduce viruses)
9.
Which of the following are not microorganisms?
Yeast
Mould
Bacteria
Ants
Ants are insects
10.
Many foods acquire their flavour or texture from the action of microorganisms. For which of the following foods is this not true?
Live yoghurt
Wine
Jelly
Bread
Bread and wine both use yeast which is a fungi. Yoghurt uses bacteria
You can find more about this topic by visiting BBC Bitesize - What is a microorganism?

Author:  Sheri Smith

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