A - MOST CHILDREN WILL …•Recognise that there are many very small organisms which can cause illness or decay, or can be used in food production •Recognise that micro-organisms feed, grow and reproduce like other organisms
B - SOME CHILDREN WILL…•Recognise that very small living things can cause illness
C - SOME CHILDREN WILL … •Describe evidence that yeast is living•Explain how micro-organisms can move from one food source to another and how this can cause food-poisoning
BACTERIA
FUNGI
VIRUS
In 1796 Edward JENNER
discovered how to make a vaccine to
treat a disease called
smallpox.He used a micro-organism called a
virus.
Vaccines and vaccination help us
to treat people.
Healthy people are given a tiny, but safe, dose of a usually harmful
germ.
This causes the body to produce
ANTIBODIES against a disease.
This is known as IMMUNISATION
In France in the 1800’s a scientist
called
Louis Pasteur
explored diseases caused
by
micro-organisms.
Some micro-organisms help us and some
harm us.
The banana is peeled. The peel is yellow and it looks white inside. It is
ripe and ready to eat!
The peel has gone darker, the inside is going yellow and it is starting to rot.
The peel has gone brown and now the inside is going brown too. It is really looking
bad and you wouldn’t want to eat it!
Now the peel has gone black and curled up, it is much smaller and drier. The inside is going darker and mushy.
The banana is attracting flies and you really wouldn’t eat it now!!!
Now the peel has really shrivelled up, the
inside is dry and wrinkly and it smells!
It is almost all black and it is much smaller than 2 weeks ago.
How long does it take for vegetable and plant waste to become soil?
When a living thing dies, it DECAYS
Micro-organisms, such as bacteria and fungi, help to rot dead plants
and animals.
How many people have a
compost bin
at home?
What is ……?
Yeast is a …
SINGLE - CELLED
The
breeds
Why do we use… ?
… is used to make
dough rise.
It is a …..
raising agent
Which bread
Has been made with
YEAST ?
How does …
Work ?
wheat
and
barleyhave
in them
Ferments the sugar
in the wheat or
barley
Multiplies by splitting
into new cells
Consumesthe sugar and Converts it intoCarbon Dioxide
&alcohol
When the bread is
baked the yeast is killed by the heat.
… and the bread rises
The carbon dioxide expands
Who uses ….. ?
Bakers mix yeast with flour, water and sugar
How can micro-organisms help to
make bread?
YEAST is a micro-organism we use to
make bread.
It starts growing when it has sugar to feed on.
It gives off a gas when it grows.
What do you think is happening inside the balloon?
www.nicebuns.co.uk
Other foods and drinks are
made using micro-
organisms too!
Food needs to
be handled
and stored with care!