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How do plants interact with their environment?
Plants cannot move around from place to place. However, they can make small
movements. How do these plants interact with their environment?
9
Sensitivity to light
As the Earth rotates, the
position of the Sun in the sky
changes. Sunflowers turn
their stems
so the
flower
points
towards
the Sun.
Sensitivity to contact
Venus flytraps close their leaves
when insects touch them.
Sensitivity to water
Roots grow towards water
that is underground.
2
How do plants make food? Complete the sentences in your notebook.
a)
To make raw sap, plants need ...
d)
To make elaborated sap, plants need ...
b)
The raw sap travels ...
e)
Elaborated sap travels ...
c)
In the leaves, the raw sap is converted into ...
f)
Plants need elaborated sap to ...
3
6
Listen and write
true
or
false
.
a)
Plants increase the amount of oxygen in the air around them.
b)
Plants do not affect the amount of water vapour in the air around them.
c)
Plants make the temperature of the air around them lower.
4
Find out about transpiration.
a)
Put a small plant in a transparent container.
Make sure the plant has some water.
b)
Cover the plant and the container.
with transparent plastic.
c)
Put the plant near a window so it has sunlight.
d)
Observe the plant for several days.
5
T
h
i
n
k
!
How do plants interact with their environment? Discuss with your partner.
Do plants move their ... ? Yes, they do./No, they don’t because ...
6
7
Quiz
Check your learning.
A
C T i V i T i E S
e)
What do you see? Why do you think
this happens? Write sentences in your
notebook.
We can see ...
This happens because the leaves ...
This process is called ...