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Practical Guide 3: Cells, Tissues and Organisms in Relation to Water
Published by the Nuffield Foundation this Revised Nuffield Advanced Biology Practical Guide is linked to chapters eight, nine and ten of Study Guide 1 . Technical information and notes for teachers about the practical activities is given in Teachers’ Guide I.
Contents
Introduction
Chapter 8: The plant and water
8A: Is the water content of a plant constant or does it fluctuate?
8B: Do roots affect the rate of water input into land plants?
8C: Is the rate of water input (and output) affected by environmental conditions around the aerial portions of the plant?
8D: What is the role of the leaf in the water vapour loss from a cut shoot?
8E: Translocation paths for water in plant stems
8F: The anatomy of a stem and how water moves up
8G: The xylem pathway
8Ha: Water movement by imbibition into a non-living physical system and into live seeds
8Hb: Increase in the mass of seeds in different soils and known solutions
8I: A demonstration of the pressure produced during imbibition
8J: Osmotic water movement into a non-living system and into living plant tissue
8K: A demonstration of the osmotic input into seedlings, producing root pressure so that the guttation droplets are extruded at special points on the leaves
8L: Water movement against gravity in a physical system and in plants
8M: A demonstration of the mechanical support function of turgor pressure produced by water iriput into leaf cells
Chapter 9: The cell and water
9A: Measurement of the water potential of cell sap by plasmolysis
9B: Diffusion o£substances against gravity in a gel
9C: Movement through a differentially permeable membrane
9D: The effect, on isolated animal cells, of altering the composition of the external medium
9E: The action of a contractile vacuole
Chapter 10: Control by the organism
10A: The relation of the urinary system of a mammal to other systems of the body
10B: Injection of the arterial blood system in the kidney
10C: The histological structure of the nephron
10D: Determination of chloride content of urine collected in different circumstances of salt intake
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