Presentation 03 - Plant Tissues

1. TissuesTissues
an integrated group of cells with a
common structure and function

2. Plant TissuesPlant Tissues
nMeristematic tissue: rapid cell division,
lengthening of shoots and roots
nDermal tissue: covering for the plant
body
nGround tissue: support, photosynthesis,
and storage
nVascular tissue: conduction of water,
food, and dissolved minerals; strengthens
and supports the plant

3. Meristematic TissueMeristematic 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

4. Apical meristemApical meristem
In shoot tips and
root tips
Allium cepa root tip
Root cap
Apical meristem
Region of cell
differentiation
/maturation
Region of cell
elongation
Region of cell
division

5. Dermal TissuesDermal 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

6. The Ground The Ground
Tissue SystemTissue System

7. Parenchyma cellsParenchyma 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

8. CollenchymaCollenchyma
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

9. SclerenchymaSclerenchyma
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

10. The Vascular The Vascular
Tissue SystemTissue System

11. Complex Complex
Vascular Vascular
TissuesTissues
Xylem
Conducts water and dissolved
minerals from the roots
Phloem
Conducts dissolved food
materials, carbohydrates,
in solution
Continuous throughout
plant
Support plant body

13. All 4 types of
tissues are present
in the root tip

14. Young dicot stem
Young monocot stem