BIO120H1 Lecture 17: Notes - (Professor Thomson)
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BIO120H1 Full Course Notes
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Mesquite: microphylly: no photosynthetic barks, but have greatly reduced leaves, prevent overheating! Santa rita prickly pear: extreme example of microphylly: no leaves, have thrones to prevent animals from taking their water, the pad-like structure are extended stems, not leaves! Cacti: have an extensive but shallow root system! Clari cation: evergreen : most important groups of land plats: angiosperms and conifers, evergreen is used as a synonym for conifers, not all conifers are evergreen, many evergreens are not conifers (especially the ones in wet tropics)! Mesophytic: ex. sugar maple, oaks, paper like, thin, exible leaves, high sa/v ratio, imsy, fragile, last one 1 season typically deciduous! Sclerophyllous: ex. sclerophyll, red pine, rs, spruces, usually evergreen, last several seasons, thick needles or scales, pine needles are used for about 3 years before shed, low sa/v ratio, tough, leathery ! In uence of leaf shape on gas exchange: laminar vs turbulent ow of uids over surface of leaf!
