Plant Structure and G rowth
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Transcript of Plant Structure and G rowth
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Plant Structure and Growth
Topic 9AHL IB BIOLOGY
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STARTER: Label the parts of a flower
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Learning Objectives• Draw and label plan diagrams to show the distribution of
tissues in the stem and leaf of a dicotyledonous plant.
• Outline three differences between the structures of dicotyledonous and monocotyledonous plants.
• Compare growth due to apical and lateral meristems in dicotyledonous plants.
• Explain the role of auxin in phototropism as an example of the control of plant growth.
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GROUP THOUGHT: Can you list 3 differences between monocots and dicots?
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GROUP THOUGHT: Why does mowing the lawn not kill the grass?
BONUS: Spot the grammar mistake!
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Watch this virtual experiment
What do you see happenning?Why do you think this is happenning?
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What’s happenning here?
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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