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1
Look at the diagram and do these activities with a partner.
a)
Describe the diagram. Name the parts of the plant:
This is the ...
b)
What do you think the red and blue arrows show?
I think the ... arrow shows ...
G
E T T i N G S T A R T E D
8
1.
The roots absorb water
and minerals from the soil
to make a special liquid
called
raw
sap
.
4.
Photosynthesis
takes place in
the leaves. They use sunlight
and carbon dioxide to convert
raw saw into elaborated sap.
The elaborated sap contains
nutrients.
5.
The
elaborated sap
,
represented here by
the red lines, travels
down the stem to
other parts of the
plant. It is the food
the plant needs to
grow.
3.
The leaves have very small holes,
called
stomata
. During photosynthesis,
carbon dioxide enters the leaf through
the stomata and
oxygen is expelled.
Small quantities of
water are also expelled
this way. This process
is called
transpiration
.
2.
The
raw sap
,
represented
here by the blue lines,
travels up the stem to the
leaves.
How do plants make their food?
Living things
We call organisms that make their own food
autotrophs.
Plants make their own food, so plants are autotrophs.
Do you know how plants make their own food?
Oxygen
Carbon dioxide
Sunlight
Carbon
dioxide
Ï
Ê
Oxygen
One mature tree
can produce more than
90 kg of oxygen in a
year, enough for several
people.
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