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9.2 Transport in angiosperms

9.2 Transport in angiosperms. STARTER : What’s happenning here ?. Past Paper Question. ( a) apical and lateral ( b) 2 max Structure Monocotyledonous Dicotyledonus leaf parallel veins branched (net of) veins; seed one cotyledon two cotyledons;

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9.2 Transport in angiosperms

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  1. 9.2 Transport in angiosperms

  2. STARTER: What’shappenninghere?

  3. PastPaperQuestion (a) apical and lateral (b) 2 max StructureMonocotyledonousDicotyledonus leaf parallel veins branched (net of) veins; seed one cotyledon two cotyledons; flower floral parts in multiple of 3 floral parts in multiple of 4 or 5; stem scattered vascular bundles ring of vascular bundles around central pith; root adventitious roots branched tap roots; Award [1] for each correct line (c)auxinproduced at apical meristem / tip; transported to growing area / zone of cell growth; lateral transport to cells on shade side; results in cellexpansion; shoot “grows” towards light source; experimental detail; 3 max

  4. LearningObjectives • Listways in which mineral ions in the soil move to the root. • Explainthe process of mineral ion absorption from the soil into roots by active transport. • Outlinefour adaptations of xerophytes that help to reduce transpiration. • Outlinethe role of phloem in active translocation of sugars (sucrose) and amino acids from source (photosynthetic tissue and storage organs) to sink (fruits, seeds, roots).

  5. Extended Response Practice transport: [3 max] water transported in xylem vessels; transpiration pull; due to loss of water vapour from leaves (and stems) / evaporation of water from leaves; cohesion of water molecules (due to hydrogen bonds) / continuous column of water; capillarity / adhesion; transpiration stream is flow of water within the plant; transpiration stream is flow of water from roots through the plant; abiotic factors: [3 max] (accept inverse statements) light: in day guard cells are open so increases evaporation and transport of water; temperature: higher temperatures increase evaporation and transport of water; wind: more wind, faster evaporation and increase transport; humidity: higher humidity in air decreases (rate of transpiration) and transport; CO2 concentration: if high, stomata close and lower transpiration rate; 6 max Outline the movement of water in plants from root to leaf, including the effects of abiotic factors on the rate of transport. (6)

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