Root meristems and primary tissues

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Root meristems and primary tissues
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Root apical meristem mitosis
Be able to identify all of the mitotic stages and
know what order they occur in. (review)
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Root promeristems
apical meristem promeristems primary tissues
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Root promeristems
What tissues are forming here?
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Dicot root primary tissuesYou should be able to
identify the tissues and cell types and know the
functions of the cell types.
Be able to identify epidermis, cortex,
parenchyma, endodermis, passage cells, stele or
vascular cylinder, pericycle, xylem,
phloem,residual procambium, casparian strips.
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Starch grains in parenchyma cells
Parenchyma cells are where plants store most of
their starch. When proplastids in parenchyma
cells are exposed to light, they often
develop into chloroplasts. Plants usually store
more starch in their roots than in their
stems. Can you think of a possible reason why
they do that?
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Monocot root primary tissues
Note that there is parenchyma in the middle of
this monocot root. Cells in the outer part
of the cortex have differentiated into fibers,
and the epidermis is disappearing. Be able to
identify epidermis, exodermis, cortex and
cortical parenchyma, endodermis and endodermal
cells, pericycle, primary phloem, primary
xylem, vessel cells, sieve cells,
undifferentiated xylem parenchyma.
(This is a cross section of a corn or maize root,
Zea.)
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Root anatomy of another monocot root
Notice that the endodermis is very lignified. Do
you think water could pass through this
endodermis?)
Be able to identify all tissues and cell types.
(These are Smilax root cross sections. The
common Name of Smilax is catbrier or sawbrier.)