29topic_11_f07

29topic_11_f07 - Topic 11 Roots monocot vs dicot roots...

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Topic 11 Topic 11 Roots Roots
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monocot vs dicot roots Dicots have what is called a “tap root” system in which there is a single major root from which branches arise. The ultimate tap root is a carrot
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Taproots carrot and plantain Daucus carota
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monocot vs dicot roots Monocots have what is called a “fibrous root system” in which there are many individual roots that originate at the base of the stem.
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Oat Seedling – Avena sativa
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Root Growth In both monocots and dicots the first root to emerge is of embryonic origin and is called the radicle . This root reacts to gravity and establishes the plant in the soil. It also develops root hairs to increase the absorbtive surface.
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radicle emergence from pea seed
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Root Hairs Root hairs are extensions of certain epidermal cells in a region behind the apical meristem known as the root hair zone . Root hairs have a finite life span because the cells of the region that they originate in matures and becomes located further back from the root tip with time.
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Dicot Root Anatomy The arrangement of the vascular tissue in an organ is known as the stele .
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Dicot Root Anatomy In dicot roots the stele is a central core of xylem surrounded by a layer of phloem.
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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_11_f07 - Topic 11 Roots monocot vs dicot roots...

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