as light passes through different substances it is refracted cornea refracts light the most SIIP Booklets for 2014 lens ensure fine, sharp focusing light rays converge on yellow spot of the retina compiled Question image on retina is upside down and reversed (left to right) papers and answer 15 min Learners complete summary of booklets Stimulation of photoreceptors: pupil mechanism on mind rods and cones are stimulated by light map. photopigments are broken down Worksheets this creates electrical impulses Focus on Life science Pathway of nerve impulses: CAPS Gr 12 by Maskew impulses travel via optic nerve to cerebral cortex Miller for interpretation Teacher provides or draws simplified version of the illustration below on Understanding Life blackboard / transparency. science Gr.12 by T Isaac – 3rd Edition Life Science Gr 12 – Top Class by Shuter’s. Teacher highlights the following for the structure of the structure of the iris: Via Afrika Life Science This is a response of the eye to changes in light intensity. GR 12 (CAPS) Iris controls the amount of light that enters the eye. It contains two set of involuntary muscles; the radial and circular muscles The muscles function antagonistically (do the opposite). Learners must be able to Teacher highlights the following for the pupil mechanism: tabulate differences in pupillary In dim light mechanisms during dim and Radial muscles contract. bright light. Circular muscles relax. The pupil enlarges (dilates). Learners complete labelling on Thus more light enters the eye. mind map. Allow for peer In bright light assessment. 15 min Radial muscles relax. Circular muscles contract. The pupil becomes smaller (constricts). Thus less light enters the eye 5 min
as light passes through different substances it is refracted cornea refracts light the most lens ensure fine, sharp focusing light rays converge on yellow spot of the retina image on retina is upside down and reversed (left to right) Stimulation of photoreceptors: rods and cones are stimulated by light photopigments are broken down this creates electrical impulses Pathway of nerve impulses: impulses travel via optic nerve to cerebral cortex for interpretation Teacher provides or draws simplified version of the illustration below on blackboard / transparency. Teacher highlights the following for the structure of the structure of the iris: This is a response of the eye to changes in light intensity. Iris controls the amount of light that enters the eye. It contains two set of involuntary muscles; the radial and circular muscles The muscles function antagonistically (do the opposite). Teacher highlights the following for the pupil mechanism: In dim light Radial muscles contract. Circular muscles relax. The pupil enlarges (dilates). Thus more light enters the eye. In bright light Radial muscles relax. Circular muscles contract. The pupil becomes smaller (constricts). Thus less light enters the eye Learners complete summary of pupil mechanism on mind map. Learners must be able to tabulate differences in pupillary mechanisms during dim and bright light. Learners complete labelling on mind map. Allow for peer assessment. 15 min 15 min 5 min SIIP Booklets for 2014 compiled Question papers and answer booklets Worksheets Focus on Life science CAPS Gr 12 by Maskew Miller Understanding Life science Gr.12 by T Isaac – 3rd Edition Life Science Gr 12 – Top Class by Shuter’s. Via Afrika Life Science GR 12 (CAPS)
gr-12-life-sciences-participant-s-manual-aprmay_2018.docx