Monocot versus Dicots

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					  Flowering Plants:
Monocot versus Dicots
      8-22-11
      Monocots & Dicots
• Botanists are able to divide the 235,000
  species of angiosperms into two large
  groups based on the structure of their
  seeds
• Inside the seeds of angiosperms are
  tiny embryonic leaves called
  cotyledons. The seeds of one group of
  angiosperms have one cotyledon, called
  monocotyledons or monocots.
• Other angiosperms have two
  cotyledons. These are called
  dicotyledons or dicots
       Cotyledon (seed leaf)
            Monocots versus Dicots




One cotyledon                   Two cotyledons
(seed leaf)                     (seed leaves)
The veins of
monocot leaves
are parallel to
each other
The leaves of
dicots usually
have netlike
veins
                           Leaves
                  Monocot versus Dicots




Base of a Monocot Leaf: Note
the Sheath which connects the   Typical Dicot Leaf with
Blade to the Stem               Reticulate (Net) Venation
    Monocot Examples
• Tulips, daffodils, irises, lilies,
  palm trees
• Do you see
  veins that are
  parallel?
       Dicot Examples

• Buttercups, peas, roses,
  sunflowers, maple trees, and
  dandelions
• Do you see the
  netlike veins?
   Which is which?
A is _____________


                     B is __________
               Stems
         Monocot versus Dicot




Cross Section of       Cross Section of a
Corn which is a        typical Dicot Stem
typical Monocot
         Root System
        Dicot versus Monocots




Dicot                           Monocot
             Floral Parts
           Monocots versus Dicots
Monocots                            Dicots
        Eudicotyledons

• What’s the difference from dicots?
  – Not much
  – Pollen Structure:
    • Eudicots – (tricolpates)3 or more pores
      set in furrows
    • Monocots, paleodicots – single pore set
      in a differentially oriented groove

				
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posted:1/16/2013
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