Post on 08-May-2015
Submitted by Ms Gooi Shu Wan
Pei Chun Public School
Topic: Living Things Need Air Sub-topics: How do plants and animals
breathe? Level: Primary 4 Number of periods: 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.
Key concepts
- 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
Carbon dioxide
Water vapour
moremorelessless
Nitrogen
Oxygen
Carbon dioxide
Water vapour
moremorelessless
moremore lessless
Plants exchange gases with the surrounding air through the stomata.
Closed stoma
Open stoma
Pictures courtesy of MicroAngela
OxygeOxygenn
OxygeOxygenn
Carbon Carbon dioxiddioxidee
Carbon Carbon dioxiddioxidee
Mammals breathe by using their lungs.
What about the mammals that live in water?
Oxygen absorbed by blood vessels in the lungs.
Carbon dioxide leaves the blood vessels and goes into the air we breathe out.
Air moves through the windpipe and other tubes.
Air enters the body through the nose and mouth.
Air leaves the body through the nose and mouth.
Picture courtesy of Encyclopaedia Britannica
Dolphin
Blowhole
Blowhole
Whale
Copyright © 1999-2006 Tigerhomes.org
Dugong / Sea Cow
Porpoise
Photo courtesy of National Geographic
© Great Barrier Reef Marine Park Authority 2005
Photo courtesy of Encyclopaedia Britannica
Seal
Photo courtesy of PDPhoto.org
Breathing hole
Fish breathe by gills.
Gills
Gill has a large surface area
and a lot of blood vessels.
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.
Next question
Next question
Gills
stomata
gills
lungs
That’s correct.
Elephant is a mammal and it breathes using its lungs.
Next question
Next question
stomata
gills
lungs
That’s correct.
Sunflower is a plant and it breathes through stomata.
Next question
Next question
stomata
gills
lungsPicture courtesy of National Geographic
That’s correct.
Walrus is a mammal and it breathes using its lungs.
SummarySummary
Picture courtesy of National Geographic
That’s incorrect. Please try
again.
That’s incorrect. Please try
again.
That’s incorrect. Please try
again.
That’s incorrect. Please try
again.
During respiration,
is released from the food
consumed.
?ENERGY
We take in and
give out .
??CARBON DIOXIDE
Living things need oxygen to carry
out ?RESPIRATION.
OXYGEN
Plants exchange gases with the
environment through ?STOMATA.
Fish breathe by using ?GILLS.
Mammals breathe by using their
?LUNGS.