Internal Structures of the Monocot Stem

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·         Internal structure of monocotyledonous stem consists of:
§  Epidermis,
§  Hypodermis,
§  Ground tissue and
§  Vascular bundles

  •      Epidermis
§  It is the outermost layer of the stem made up of single layer of parenchymatous cells and covered with a thick cuticle in some plants
§  Consists of few stomata

·         Hypodermis
§  Is made of few layer of sclerenchymatous cells lying below the epidermis
§  This layer gives mechanical strength to the plant 

·         Ground Tissue
§  Consists of cells inner to the hypodermis
§  Is not distinguished into zones like the dicot stem
§  The cells contain reserve food material e.g. starch
§  Contains the vascular bundles
§  Carry out gaseous exchange function

·         Vascular Bundles
§  Vascular bundles are scattered in the ground tissue
§  The vascular bundles are conjoint, collateral, endarch and closed
§  Vascular bundles are skull shaped

§  Xylem
§  Forms the woody part of the plant
§  Carries water and minerals up the plant

§  Dead at functional maturity


§  Phloem
§  Consists of sieve tubes and companion cells
§  Phloem parenchyma and phloem fibres are absent


 Close-up Photo of a Butterfly
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Internal Structures of the Monocot Stem 3

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