Submitted by Ms Gooi Shu Wan Pei Chun Public School 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. 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 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.