Life Science Grade 11

Grade 11 Life Sciences Lesson Plans• By examining morphological features such as external and internal structures anddevelopmental features such as the number of tissue layers within a developing embryo,the animal’s symmetry, number of openings in the gut, scientists can refer to an organismsbody plan• The body plan may be used to determine how complex an organism is• Each phyla will be examined through the organisms body plan• When looking at plant and animal diversity, various groups show a progressivedevelopment from less complex to more complex structures.• This suggests that all life forms may have arisen from a common ancestor and this type ofevolutionary relationship among different species may be illustrated by a phylogenetictree• An example of a phylogenetic tree is a cladogram2.3 Conclusion• Give learners informal assessment by asking them to answer questions relating to thephylogenetic tree.• Learners to colour in the diagram showing the diversity of the animal groups providedLearners need to examine aphylogenetic tree and discussthe relationships that areillustrated15 min15 minSolutions for all Fig 3.2 p89Study and Master Fig 1.3.1p115Understanding Life SciencesFig 1.3.17 p106Understanding Life SciencesActivity 1.3.10 Question 1 p 106HomeworkDivide the class into groups of about four learners per group; assign each group a differentphylum. As long as all the phyla are allocated and depending on the size of the class, somephyla may need to be repeated amongst the groups. Each learner is to find information on thedistribution of their phylum in southern Africa.Reflection / Notes:Name of Teacher:Sign:Date:HOD:Sign:Date:Term 1 Page 56© Gauteng Department of Education (CAPS version)