Support and transport in plants (1)

Support and transport in plants (1) - SUPPORTANDTRANSPORT...

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SUPPORT AND TRANSPORT  IN PLANTS ANATOMY OF DICOT PLANTS
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The Root Two types of root systems - tap root system - adventitious root system TAP ROOT SYSTEM ADVENTITIOUS ROOT SYSTEM - Arises from the radicle of the  embryo - Arises from any part of the  plant except from the radicle of  the embryo - Main root can be distinguished - Main root cannot be  distinguished
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Functions of the roots They anchor the plant firmly to the ground. They absorb water and mineral salts.
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External Structure of Root Tip   Root cap is made up of parenchyma  cells. It protects the inner layers of the  root. The growing point is made up of  meristematic cells.  Some of the new cells  produced replace the parenchyma cells of  the root cap which were damaged. Region of elongation – the cells comes  from the growing point which begin to  elongate. The root hair region has root hairs,  which absorb water and mineral salts. Internally the cells in this region begin to  differentiate into epidermis, parenchyma,  sclerenchyma, xylem and phloem  Mature region has side roots and fully  differentiated tissues.
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Transverse section of young dicot root, in plan
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Transverse section of a young dicot root in detail
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Enlarged Root Hair
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Functions of the various root tissues . The root hairs of the epidermis absorb water and mineral salts. The parenchyma of the cortex stores starch and the intercellular spaces allow water and mineral salts to pass through The passage cells of the endodermis direct water into the xylem of the stele. The pericycle gives rise to side roots The xylem transports water and mineral salts from the roots to the stem and leaves. It also provides strength to the plant. The phloem transports manufactured food from the leaves to the roots. The vascular cambium gives rise to additional xylem and phloem as the root grows in thicknes s
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The Stem Functions of the stem: They hold the leaves in a favourable position to receive light for photosynthesis. They hold the flowers in a favourable position for pollination. Most stems contain chlorophyll and they therefore manufacture food by the process of photosynthesis. They store food and water They transport water and mineral salts from roots to leaves They transport food from the leaves to the roots
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External s tructure of a dicot s tem
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plan
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Support and transport in plants (1) - SUPPORTANDTRANSPORT...

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