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915 State that dicotyledonous plants

Page history last edited by Jay 13 years, 11 months ago

Back to 9.1 Structure of Plants

 

9.1.5. State that dicotyledonous plants have apical and lateral meristems.

  

A meristem is the tissues in all plants which are consist of undifferentiated cells. A mersitem is found in zones of the plant where growth can take place. Meristems can be apical (at the root or stem tip), or lateral (thickening layers of cambium).

 

Dicotyledonous plants have apical and lateral meristems, which are used for generating new cells for the growth of the plant.

 

The meristematic tissue is formed exclusively by undifferentiated or embryonic cells. These cells are responsible for bringing the growth of the plant body due to their capacity to undergo continuous mitotic division.

 

Apical Meristems are …:

-          Located at the tip of roots and in the buds of shoots

-          Supply cells for the plant to grow in length (primary growth)

-          Allows roots to ramify throughout the soil and allows shoots to increase their exposure to light and carbon dioxide

-          Comparatively small

-          Cell division takes place in apical meristematic region

-          During flowering process, apical meristem of the shoot produces the floral meristem, which produces the flowers themselves

-          Floral meristem is actually responsible for determinate growth, which limits the growth of the flower to a particular form and size

 

 

Lateral Meristems are…:

-          Cylinders of dividing cells extending along the length of roots and shoots that increase the girth of the plant

-          Part of secondary growth, which is a progressive thickening of the roots and shoots formed earlier by primary growth

-          Comparatively large

-          Cell division takes place in vascular cambium

 

http://en.wikipedia.org/wiki/Meristem

 

Comments (3)

HL-Eun Ji said

at 4:39 pm on Apr 18, 2010

Jennifer's answer to the assessment statement was very clear and nicely done. There was nothing to edit except that the second link she gave at the bottom didn't work.. so I deleted it ( I hope that was okay, I saved the link just in case..)

HL-Jin Su said

at 3:14 pm on Apr 18, 2010

Does every plant have lateral meristems? Or is it that only big plants, such as apple trees have lateral Meristems?

HL-Eun Ji said

at 8:54 pm on Apr 15, 2010

Are lateral meristems located on every part of a plant (leaf, stem, root) or are they located just in the stem?

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