an integrated group of cells with a common structure - - PowerPoint PPT Presentation

• an integrated group of cells with a

common structure and function

• 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

• cells that do not

differentiate

cells retain the ability to

divide

Types: Types:

Apical – primary growth at

root and shoot tips

Lateral – secondary growth

in trees and shrubs

Intercalary – secondary

growth in monocot stems

• In shoot tips and

root tips

Allium cepa root tip

Region of cell differentiation /maturation Region of cell elongation Root cap Apical meristem Region of cell division

• Single layer of cells called the

epidermis in herbaceous plants

Guard cells Trichomes

Epidermis

Trichomes Root hairs

Functions

Absorption Secretion of cuticle Protection Control of gas exchange

Cuticle

• beneath the epidermis in

young stems and in large veins of leaves

elongated cells that have

unevenly thickened cell unevenly thickened cell walls

alive at maturity flexible support system found uniformly throughout

the plant

• structural support

two types:

fibers – support in

wood, bark, leaves, stems stems

sclereids – protection

in fruits, seeds, other plant organs

primary and secondary cell

walls.

dead at functional maturity

• Xylem

Conducts water and dissolved

minerals from the roots

Phloem Conducts dissolved food

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