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Plants Part 4

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Plants Part 4 Roots Roots Serve 3 important functions: anchors, absorb minerals and water, and they transport those minerals and water Two main types of roots ... – PowerPoint PPT presentation

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Title: Plants Part 4


1
Plants Part 4
  • Roots

2
Roots
  • Serve 3 important functions anchors, absorb
    minerals and water, and they transport those
    minerals and water
  • Two main types of roots
  • Taproots are long and thick and have secondary
    roots emerging from that root. Dicots have
    taproots.
  • Fibrous roots are many roots of about the same
    size, each with secondary roots. Monocots have
    fibrous roots.

3
  • Another type of root called the adventitious
    roots are when the roots emerge from other
    tissues like the stem and leaves, and prop up the
    plant in support.
  • Tuberous roots are a lateral root that is
    specialized to store carbohydrates. Example
    yams, cassava

4
Types of Tissues in Roots
  • Epidermis is one cell layer thick and is the
    outermost layer of the root. It protects and
    absorbs water and mineral from the soil. Has
    specialized cells that form root hairs that
    increase surface area.
  • The cortex is a layer of cells found just below
    the epidermis and has some cells that store
    molecules like starch, transport water and
    minerals from the epidermal cells to the centre
    of the root by osmosis.
  • Cortex has a wax coating on the inner layer
    called the endodermis.

5
  • The Casparian strip surrounds the endodermal
    cells, prevents water from entering back into the
    cortex. Minerals must be pumped by active
    transport into the vascular cylinder. This layer
    controls the movement of water and minerals.

6
  • The vascular cylinder contains the plants
    conducting tissues the xylem and the phloem.
  • The xylem conducts water and minerals to the
    leaves
  • The phloem conducts the sugars from the leaves to
    other parts of the plant.
  • Monocot root vs dicot root
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