Life Science Grade 11

Grade 11 Life Sciences Lesson PlansGRADE 11 SUBJECT Life Sciences WEEK 3 TOPIC Immune response in plants and animals LESSON 1& 2LESSON SUMMARY FOR: DATE STARTED:LESSON OBJECTIVESDATE COMPLETED:Content:• Both plant and animals display a natural passive immunity that helps prevent pathogens from entering an organismThe immune response to pathogens entering humans is to produce anti-bodies that are part of a natural immunity• Immunity may also be acquired by getting a mild form of the disease and getting better or through artificial means in the form ofvaccinations• Plants also have an active immune response to pathogens and produce chemicals that will prevent the infection from spreadingThe learner must be able to:• Explain the passive immune response in plants and animals• Discuss how active immunity allow plants and animals to respond to pathogens that enter organisms• Describe the immune response occurring in plants and animals• Complete a concept map relating to immunityTEACHER ACTIVITIES LEARNER ACTIVITIES TIMING RESOURCES NEEDED1.1 Introduction• Pre –knowledge: how the tissues in the human help protect the body, white blood cellsand their function• Remind learners that external structures such as bark on a tree and a waxy cuticle on aleaf help protect the inner tissues in plants. Also that the skin on humans has the samefunction and provides a barrier to bacteria and other micro-organisms.2.2 Main Body (Lesson presentation)• The following must be highlighted by use of blackboard/transparencies and classdiscussion:• Passive immunity in humans involves our body’s ability to produce mucous in the noseand throat and tears in the eye. Our skin also provides a barrier that helps preventbacteria and other pathogens from entering our body.• Passive immunity in plants involves sticky secretions given off by plants that make itdifficult for them to be eaten and chemical secretions that are poisonous to manyorganisms. E.g. fruits that contain large amounts of vitamin C and bioflavonoids (naturalanti-bacterial and antiviral compounds)• Active immunity in humans occurs when a disease-causing micro-organism enters ourbody.• The white blood cells (lymphocytes) produce antibodies which then combine with thepathogen to destroy it.• Some lymphocytes become memory cells that will then destroy the pathogen if it everenters the body again• In this way we acquire immunity10 min15 min• Reference:Term 1 Page 19© Gauteng Department of Education (CAPS version)