ANGIOSPERMS:Monocot versus Dicots
ANGIOSPERMS:Monocot versus Dicots
Biology 112Biology 112
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 (seed leaf)
Two cotyledons (seed leaves)
The veins of The veins of monocot leaves monocot leaves are parallel to are parallel to each othereach otherThe leaves of The leaves of dicots usually dicots usually have netlike have netlike veinsveins
LeavesMonocot versus Dicots
Base of a Monocot Leaf: Note the Sheath which connects the Blade to the Stem
Typical Dicot Leaf with 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?
B is __________
A is _____________
StemsMonocot versus Dicot
Cross Section of a typical Dicot Stem
Cross Section of Corn which is a typical Monocot
Root SystemDicot versus Monocots
Dicot Monocot
Floral PartsMonocots versus Dicots
Monocots Dicots