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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; - PowerPoint PPT Presentation
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9.2 Transport in angiosperms
STARTER: What’s happenning here?
Past Paper Question(a) apical and lateral
(b) 2 maxStructure Monocotyledonous Dicotyledonusleaf 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) auxin produced at apical meristem / tip;transported to growing area / zone of cell growth;lateral transport to cells on shade side;results in cell expansion;shoot “grows” towards light source;experimental detail; 3 max
Learning Objectives• List ways in which mineral ions in the soil move to the root.
• Explain the process of mineral ion absorption from the soil into roots by active transport.
• Outline four adaptations of xerophytes that help to reduce transpiration.
• Outline the role of phloem in active translocation of sugars (sucrose) and amino acids from source (photosynthetic tissue and storage organs) to sink (fruits, seeds, roots).
Extended Response Practice
Outline the movement of water in plants from root to leaf, including the effects of abiotic factors on the rate of transport. (6)
transport: [3 max]water transported in xylem vessels;transpiration pull;due to loss of water vapour from leaves (and stems) / evaporation of water fromleaves;cohesion of water molecules (due to hydrogen bonds) / continuous column ofwater;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 ofwater;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
