UNI101Y1 Study Guide - Hard Water, Sodium Bicarbonate, Cladocera
16 Feb 2013
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Document Summary
Unicellular algae use droplets of oil to float. Streamlined shapes (high viscosity of water hampers mvmt) Filamentous appendages (take advantage of water viscosity) As animals become smaller, the momentum of their mvmt decreases relative to the viscosity of water. A tiny water flea seems to be swimming in molasses. But what impedes swimming also prevents sinking. Orgnms require huge amounts of: h, c, o (the elements in carbs) Also need n, p, s, k, ca, mg, fe. Ex. diatoms construct their glassy shells from silicates. Ex. tunicates (sessile marine invertebrates) accumulate vanadium (defense against predators) Animals get nutrients from plants, plants from water. Can dissolve many substances (makes them accessible to living sys. and provides a medium within which they can react) Water molecules are strongly attracted to many solids (these compounds consist of electrically charged atoms or groups of atoms, iioonnss) Water molecules have both +ve and ve charges. Allows presence of minerals in water bodies.
