29topic_7_f07

29topic_7_f07 - Topic 7 Plant External Morphology What is...

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Topic 7 Topic 7 Plant External Plant External Morphology Morphology
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What is the difference What is the difference between a tree and a between a tree and a shrub? shrub?
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Overview Overview Of Of Whole Whole Plant Plant
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apical bud Apical bud of Avocado shoot Apical bud of Avocado shoot
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microscopic view of the apical bud
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In the angle between the stem and In the angle between the stem and the petiole are found the the petiole are found the lateral lateral or axillary buds or axillary buds which can develop which can develop into branches into branches
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Alternating pairs of opposite leaves provide maximum light absorption. This is enhanced by the elongating internodes and petioles
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Leaves are arranged in one of three ways, alternate, opposite or whorled
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Are all leaves the same?
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Simple leaves: Simple leaves: pinnate venation palmate venation parallel venation Compound Leaves: Compound Leaves: pinnately compound bipinnately compound a b c d e f
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Many different leaf margin patterns Many different leaf shapes
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The reticulate network of major and minor veins in a leaf midri b
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The elongation and direction of growth of the petioles provides good illumination for all the leaves.
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The agave leaves have no petioles, therefore the angle of emergence from the stem determines exposure to light
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Grass leaves grow by intercalary meristems at the base of the leaves
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This note was uploaded on 04/08/2008 for the course BIO 29 taught by Professor Mcgowan during the Spring '08 term at CUNY Brooklyn.

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29topic_7_f07 - Topic 7 Plant External Morphology What is...

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