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

2. Plant Tissues
n Meristematic tissue: rapid cell division,
lengthening of shoots and roots
n Dermal tissue: covering for the plant
body
n Ground tissue: support, photosynthesis,
and storage
n Vascular tissue: conduction of water,
food, and dissolved minerals; strengthens
and supports the plant

3. 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

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

5. Dermal Tissues
Epidermis
 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 Cuticle

6. The Ground
Tissue System

7. 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

8. 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

9. 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

10. The Vascular
Tissue System

11. Complex
Vascular
Tissues
 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