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!