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912 Outline three differences

Page history last edited by HL-Eun Ji 14 years ago

Back to 9.1 Structure of Plants

 

9.1.2 Outline three differences between the structures of dicotyledonous and monocotyledonous plants.

  

Because the question asks for three differences, making a table may be easy for a distinct contrast between the two plants.

 

Monocotyledonous plants  Dicotyledonous plants
Parallel venation in leaves Netlike venation pattern in leaves 
3 flower parts or multiples of 3  4 or 5 flower parts or multiples of 4 or 5 
Seeds contain only one cotyledon (seed leaf; first leaf) after germination Seeds contain two cotyledons (seed leaves; first leaves) after germination
Vascular bundles arranged randomly throughout the stem Vascular bundles arranged as a ring in the stem
Root system mainly fibrous -Adventitious roots

Root system involves a taproot (main root)-

Branching roots

 

 

Pictures for Understanding

  

Leaf Ventilation

  

venation 

<http://oak.cats.ohiou.edu/~braselto/readings/structure.html>

Monocot vs. dicot leaves: left is daylily, a monocot; right is mint, a dicot.

  

Flowers

  

flowers 

<http://oak.cats.ohiou.edu/~braselto/readings/structure.html>



Monocot vs. dicot flowers: left is spiderwort, a monocot; right is phlox. a dicot.

 

Embryos

 

<http://leavingbio.net/FLOWERING%20PLANTS_files/image070.jpg> 

Monocot vs. dicot embryos: left is bean seed, a dicot; right is corn seed, a dicot.

 

Stems

 <http://biology.unm.edu/ccouncil/Biology_203/Images/FloweringPlants/MonocotDicotStemOverview.jpeg>

Monocot vs. dicot stems: left is a monocot; right is a dicot

 

Roots

  

 <http://homepage.smc.edu/hodson_kent/plant_growth/Angiosperms/ID/3%20root%20systems.jpg>

 

Monocot vs. dicot roots: monocot has fibrous roots and dicot has adventitious roots with taproot (main root).

 

 




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