Submitted by Ms Gooi Shu Wan
Pei Chun Public School
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Topic:
Sub-topics:
Level:
Number of periods:
Living Things Need Air
How do plants and animals breathe?
Primary 4
2 (1 hour)

Specific Instructional Objectives
After completing the lesson, pupils will be able to:
compare how plants, fish and mammals take in
oxygen and give out carbon dioxide.
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Key concepts
-
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Plants exchange gases with its environment through
stomata.
Fish breathe using gills.
Mammals breathe using their lungs.
Process Skills
-
Observing
Comparing
Why do living
things need
air?
We need
OXYGEN
to carry out
RESPIRATION.
What is
RESPIRATION?
 Respiration is the process which
releases energy from the food
consumed.
 It uses oxygen and gives off carbon
dioxide.
 Nitrogen
 Oxygen
 Nitrogen
more
 Oxygen
less
 Carbon dioxide
less
 Carbon dioxide
more
 Water
vapour
less
 Water
vapour
more
 Plants exchange gases with the
surrounding air through the stomata.
Closed
stoma
Open
stoma
Pictures courtesy of MicroAngela
Oxygen
Carbon
dioxide
Carbon
dioxide
Oxygen
 Mammals breathe by using their
lungs.
Oxygen
absorbed by
blood vessels
Air
Air moves
leaves
inAir
theenters
lungs.
through
the bodythe
the body
Carbon
dioxide
windpipe
and
through
the
through
leaves
thethe
other
tubes.
nose
and
nose vessels
and
blood
mouth.
mouth.
and
goes into
the air we
Picture courtesy of Encyclopaedia Britannica
breathe
out.
What about the mammals
that
live
in water?
Blowhole
Dolphin
Blowhole
Copyright © 1999-2006 Tigerhomes.org
Whale
Dugong /
Sea Cow
Photo courtesy of National Geographic
© Great Barrier Reef Marine Park Authority 2005
Porpoise
Photo courtesy of Encyclopaedia Britannica
Seal
Photo courtesy of PDPhoto.org
Breathing
hole
 Fish breathe
by gills.
 Gill has a large
surface area and
a lot of blood
vessels.
Gills
Carbon dioxide is
removed from
blood vessels
through the gills.
Oxygen in the
water absorbed
into blood vessels
through the gills
Match the following living things to the
parts they use for breathing.
stomata
gills
lungs
That’s correct.
Shark is a fish
and it breathes
through gills.
Gills
Next
question
stomata
gills
lungs
That’s correct.
Elephant is a
mammal and it
breathes using
its lungs.
Next
question
stomata
gills
lungs
That’s correct.
Sunflower is a
plant and it
breathes through
stomata.
Next
question
stomata
gills
lungs
Picture courtesy of National Geographic
That’s correct.
Walrus is a
mammal and it
breathes using
its lungs.
Picture courtesy of National Geographic
Summary
That’s incorrect.
Please try again.
That’s incorrect.
Please try again.
That’s incorrect.
Please try again.
That’s incorrect.
Please try again.

Living things need oxygen to carry out
?
RESPIRATION.

During respiration,
ENERGY
?
is released from the food consumed.

We take in
give out
?
CARBON DIOXIDE
?
OXYGEN
and
.

Plants exchange gases with the environment
through
?
STOMATA.

Fish breathe by using

Mammals breathe by using their
?
GILLS.
?
LUNGS.