4 The Rise and Fall of Dinosaurs Dinosaurs are found in the fossil record starting about 230 million years ago.The last dinosaurs bcame extinct about 65 million years ago.Impact Hypothesis: A 10km-wide meteorite had smashed into the Yucatan peninsula in Mexico, causing worldwide forest fires, tsunamis several kilometres high, and an 'impact winter'
5 The Rise and Fall of Dinosaurs Evidence prior to impact that diversity of dinosaur species was on the decline.Climate change?Rise of Angiosperms?Sometime in the Mid- Cretaceous Period; between 144 to 65 Million Years AgoCorresponds with a decline of the gymnosperms and rise of animal groups
6 Why Dinosaurs Went Extinct! The Far Side by Gary Larson.
7 Basic Flower Structure stigmacarpelgynoeciumloculeFlower is perfectFlower is monoeciousstylepollenovuleovaryantherfilamentstamenandroeciumpetalcorollasepalperianthreceptaclecalyxPerianth is completepedicel
8 Some Example Stories:Perfect Flowers: Pea exclusively self-pollinatingHibiscus self-pollinating if not crossedCherry self-incompatible only outcrossesImperfect Flowers: Begonia unisexual but monoeciousHolly unisexual and dioeciousVariable: Cucumber male, perfect, female, parthenocarpic
9 Basic Flower Structure stigmacarpelPistil is simplegynoeciumloculeFlower is perfectFlower is monoeciousstylepollenovuleovaryanthersuperiorfilamentstamenFlower is hypogynousandroeciumpetalcorollasepalperianthreceptaclecalyxPerianth is completepedicel
12 This longitudinal section view does not allow us to consider symmetry Basic Flower StructurestigmacarpelPistil is simplegynoeciumloculeFlower is perfectFlower is monoeciousstylepollenovuleovaryanthersuperiorfilamentstamenFlower is hypogynousandroeciumpetalcorollasepalperianthreceptaclecalyxPerianth is completepedicelThis longitudinal section view does not allow us to consider symmetry
13 Flower Formula: Symbol Sequence to Diagram Flower * 5, 5, , 5 * 5, Symmetry: *=radial †=bilateral* 5, 5, , 5* 5,* 5, 5,* 5, 5, ,*Number of Parts per Whorl:sepals in calyxpetals in corollastamens in androeciumcarpels in gynoeciumFusion within whorl:curved line over numberFusion between whorls:square bracket below numbersAttachment of flower parts relative to ovary:horizontal line