Transcript PLANT TISSUES: VASCULAR SYSTEM

PLANT TISSUES:
VASCULAR TISSUES
The Circulatory
System of Plants!
The Vascular System:
For plants to survive, they must…
 take in nutrients & water from environment
 transport water up to the leaves, and glucose back
down for storage
The plant’s vascular system is their “circulatory
system” designed to transport materials with the
plant!
Plant Tissues:

Cells specialize to take on certain roles
within the plant. Structures are formed from
specialized tissues. (See Figure 1,pg. 286)

Differentiation:
–
A change in the form of cells to allow them to
carry out a particular function.
Plant Tissues (Con’t):
Meristematic Tissue:
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Cells that can rapidly divide  produce all
growth in plants
Unspecialized cells found at the tips of
stems, roots, in rings around the stems of
larger plants, etc.
Plant Tissues (Con’t):
Dermal Tissue:
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Cells that protect the outer layers of a plant –
epidermis is the outermost layer.
These cells protect plants from disease & predators,
and prevent water loss.
On stems and leaves, these cells often produce a
waxy cuticle.
On roots, these cells have fine root hairs to aid in
absorption of water.
Plant Tissues (Con’t):
Ground Tissue:


The internal non-vascular tissues
Could be specialized for storage, support,
photosynthesis, etc.
Plant Tissues (Con’t):
Vascular Tissue:
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Cells that specialize in transport of water &
other substances among cells
Two types of tissues:
– Xylem
– Phloem
Vascular Tissues (Con’t):
Xylem:


water-conducting cells - from roots up to rest
of the plant
after maturation, these cells die; leaving
thick-walled, hollow cells that are pitted or
open at the ends  ideal for water transfer
Vascular Tissues (Con’t):
Phloem:
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food-conducting cells - from one part of plant
to another (mostly down towards roots)
these living cells have large pores at their
ends and share cytoplasm ideal for food
transfer
Types of Plants:
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MONOCOTS
–
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Many vascular bundles throughout the stem
DICOTS
–
Vascular bundles arranged in a ring … some form
well-developed ring with bark, etc.
–
THE END!!!