Tissues
Tissues
an integrated group of cells
with a common structure and
function
Tissues
Tissues
an integrated group of cells
with a common structure and
function
Plant Tissues
Plant Tissues
1.
Meristematic tissue
: rapid cell
division, lengthening of shoots and
roots
2.
Dermal tissue
: covering for the
plant body
3.
Ground tissue
: support,
photosynthesis, and storage
4.
Vascular tissue
: conduction of
water, food, and dissolved minerals;
strengthens and supports the plant
Meristematic Tissue
Meristematic Tissue
cells that do not
differentiate
cells retain the ability
to divide
Types:
Apical
– primary growth
at root and shoot tips
Lateral
– secondary
growth in trees and
shrubs
Intercalary
– secondary
growth in monocot stems
Apical meristem
Apical meristem
In shoot tips and
root tips
Allium cepa root
tip
Root cap
Apical
meristem
Region of
cell
differentiati
on/maturati
on
Region of cell
elongation
Region of cell
division
Dermal Tissues
Dermal Tissues
Single layer of cells called
the
epidermis
in
herbaceous plants
Guard cells
Trichomes
Root hairs
Functions
Absorption
Secretion of cuticle
Protection
Control of gas exchange
Epidermis
Cuticle
The Ground
The Ground
Tissue System
Tissue System
Parenchyma cells
Parenchyma cells
spherical-shaped cells
found throughout plant
thin primary walls
living, metabolizing tissue
functions:
Photosynthesis & respiration
Storage (starch, oil droplets,
water, and salts)
Wound healing & regeneration
Collenchyma
Collenchyma
beneath the epidermis
in young stems and in
large veins of leaves
elongated cells that
have unevenly
thickened cell walls
alive at maturity
flexible support system
found uniformly
throughout the plant
Sclerenchyma
Sclerenchyma
structural support
two types:
fibers
– support in
wood, bark, leaves,
stems
sclereids
– protection
in fruits, seeds, other
plant organs
primary and secondary
cell walls.
dead at functional
maturity
The Vascular
The Vascular
Tissue System
Tissue System
Complex
Complex
Vascular
Vascular
Tissues
Tissues
Xylem
Conducts water and
dissolved minerals from the
roots
Phloem
Conducts dissolved food
materials, carbohydrates,
in solution
Continuous
throughout plant
Support plant body
All 4 types of
tissues are
present in the
root tip
Young dicot stem
Young monocot stem
