9
Nucleus
Membrane
Plant cell
2
Copy and complete the sentences in your notebook.
a)
All living organisms are made up of
c)
Plant and animal cells contain
b)
Plant cells have
, and
d)
Living things can be
, such as yeast and
that animal cells do not have.
bacteria, or
such as
and
3
5
Listen. Then choose the correct answer.
a)
her hands – her hair
c)
make you ill – make you strong
b)
bacteria – soap
d)
in the fridge – in the bin
4
Find out about bacteria. Answer the questions.
a)
What three shapes are typical of bacteria?
c)
How does pasteurisation affect the bacteria in milk?
b)
How do bacteria help cows digest their food?
d)
How do bacteria help change milk into yogurt?
5
Make two models: an animal cell and a plant cell.
a)
Use plasticine to make the models.
b)
Label the parts of each cell.
6
6
QUIZ
Check your learning.
A
C T I V I T I E S
Plant cells have a rigid
cell wall
around the
membrane. This helps support the plant.
In the cytoplasm of plant cells,
there are special
organelles
called
chloroplasts
. They contain a green
liquid called chlorophyll. This
liquid carries out photosynthesis
by transforming sunlight and
nutrients into energy.
Plant cells have a
vacuole
,
which is like a bag. Food
and water are stored in the
vacuole. When a plant doesn’t
have enough water, the
vacuole empties, the plant
loses its rigid structure and
begins to wilt. A few minutes
after giving the plant some
water, the vacuole fills with
water and the plant becomes
rigid again.
Unicellular and multicellular organisms
Some living things, such as bacteria or yeast, are made up of only
one cell. They’re
unicellular organisms
.
Other living things, such as trees or butterflies, have many cells.
They’re
multicellular organisms
.
