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Flowering Plants: Monocot versus Dicots

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

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Flowering Plants: Monocot versus Dicots

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  1. Flowering Plants:Monocot versus Dicots 8-22-11

  2. 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

  3. Cotyledon (seed leaf)Monocots versus Dicots One cotyledon (seed leaf) Two cotyledons (seed leaves)

  4. The veins of monocot leaves are parallel to each other The leaves of dicots usually have netlike veins

  5. 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

  6. Tulips, daffodils, irises, lilies, palm trees Do you see veins that are parallel? Monocot Examples

  7. Dicot Examples • Buttercups, peas, roses, sunflowers, maple trees, and dandelions • Do you see the netlike veins?

  8. Which is which? A is _____________ B is __________

  9. StemsMonocot versus Dicot Cross Section of a typical Dicot Stem Cross Section of Corn which is a typical Monocot

  10. Root SystemDicot versus Monocots Dicot Monocot

  11. Floral PartsMonocots versus Dicots Monocots Dicots

  12. 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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