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