Life Science Grade 11

Grade 11 Life Sciences Lesson PlansGRADE 11 SUBJECT Life Sciences WEEK 7 TOPIC Animal Diversity: Characteristics of body plans – Body Cavity andThrough GutLesson 4LESSON SUMMARY FOR: DATE STARTED:Content: (CAPS p41)Key features in respect of body plans:• The number of openings in the gut;• Coelom and blood systems.DATE COMPLETED:LESSON OBJECTIVESThe learner must be able to:• Discuss the differences between triploblastic and diploblastic animals regarding body cavities• Describe where the coelom lies in triploblastic animals• Explain the functions of a body cavity in animals• Describe and give examples of animals who have a blind gut and animals who have a through gut• Analyse a body plan of an animalTEACHER ACTIVITIES LEARNER ACTIVITIES TIMING RESOURCES NEEDED1.1 Introduction• Refer to the previous lesson by going through homework fromyesterday and remind learners that a body plan for an animalincludes symmetry, and tissue layers (the endoderm, mesoderm,and ectoderm in triploblastic animals and endoderm andectoderm in diploblastic animals• Body plans for animals also include the presence of a body cavityand a through gut.2.2 Main Body (Lesson presentation)• The following must be highlighted by use ofblackboard/transparencies and class discussion:• A body cavity (coelom) is a fluid-filled space that lies betweenthe digestive tract and the outer body wall• This area lies between the endoderm and mesoderm intriploblastic animals except in the phylum Platyhelminthes(tapeworms)• Diploblastic animals do not have a body cavity and are known asacoelomate• The body cavity has several important functions such as providingspace for developing internal organs, acting as a hydrostaticskeleton allowing muscles to act upon it for locomotion,cushioning internal organs from injury and separating the gut wallfrom the body wall• The organs of the digestive system, excretory system, circulatoryLearners provide answersto definitions fromyesterday’s homework.Learners need to draw adiagram classifyinganimals according to thepresence of a coelom.Learners write notesdefining: coelom,acoelomate andadvantages of having acoelom.10 min20 min • Internet reference for body cavities:• http://waynesword.palomar.edu/trnov01.htm• http://kentsimmons.uwinnipeg.ca/16cm05/1116/16anim4.htmSolutions for all p 94Study and Master p118-119Understanding Life Sciences p88-89Term 1 Page 65© Gauteng Department of Education (CAPS version)