/
TISSUE SYSTEMS TISSUE SYSTEMS

TISSUE SYSTEMS - PowerPoint Presentation

karlyn-bohler
karlyn-bohler . @karlyn-bohler
Follow
382 views
Uploaded On 2017-04-18

TISSUE SYSTEMS - PPT Presentation

In the Plant Body A section taken through any region of a typical plant body shows the presence of three tissue systems Epidermal Tissue System Origin It is a derivative of protoderm ID: 538826

vascular tissue plant leaf tissue vascular leaf plant body stem epidermal cells epidermis system stomata called root ground bundle

Share:

Link:

Embed:

Download Presentation from below link

Download Presentation The PPT/PDF document "TISSUE SYSTEMS" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.


Presentation Transcript

Slide1

TISSUE SYSTEMS

In the Plant BodySlide2

A section taken through any region of a typical plant body shows the presence of three tissue systems. Slide3
Slide4
Slide5

Epidermal

Tissue System

Origin -

It is a derivative of

protoderm

.

It is represented by the epidermis and the associated structures, which are mainly involved in

providing protection to the plant body. The epidermis is the outermost covering of the plant body. It is commonly described as the skin of the plant body. Slide6

In the stem and the leaf, the epidermal cells are thick-walled and are meant for protection. In the leaf, there are two epidermal layers, one on each surface of the leaf.Slide7

In the roots, the epidermal cells are thin-walled, since they are mainly involved in the absorption of water and mineral salts.

In the root, the epidermal hairs are unicellular and are called

root hairs

. The

root hairs penetrate between the soil particles to absorb water and minerals Slide8

In the stem and the leaf, the epidermal hairs are involved in the secretion of some compoundsSlide9

Structure of a leaf

PALISADE LAYER

SPONGY LAYER

STOMATA

CUTICLE

VEIN

AIR SPACESSlide10

How are palisade cells specialised?Lots of chloroplasts, which contain chlorophyll to catch light energy.Long and thin, so they pack closely together to collect as much light as possible.

They are at the top of the leaves, to get as much light as possible.Slide11

How does the carbon dioxide get inside the leaf?Slide12

The epidermis of the stem and the leaf is usually surrounded by a thin, covering called cuticle. It is formed by a waxy substance called

cutin.

It’s function is preventing excessive evaporation of water. Cuticle is absent in the root epidermis.Slide13

stomataThe epidermis of the leaf and herbaceous stem (green stem) contains numerous small openings called

stomata

.

Each stoma is surrounded by a pair of modified epidermal cells called the

guard cells

. The stomata take part in functions such as

transpiration, respiration and photosynthesis.

Stomata are absent in the epidermis of the root and woody stem.Slide14

Leaf Stomata: Allow Gas Exchange

Stomata in

Zebrina

leaf epidermis

Guard cells with chloroplasts

Stoma

Subsidiary cellsSlide15
Slide16

Vascular Tissue System

The vascular tissue system is a derivative of

procambium

. It is represented by the

conducting tissues-xylem and phloem.

These

vascular tissues occur in the form of strands extending from one end of the plant body to another. These strands are known as vascular bundles or fascicles. In the leaf, the vascular bundles are known as veins.Slide17

Vascular Tissue System

The vascular bundles may sometimes enclose a piece of meristematic tissue called

cambium

, which brings about secondary growth in the bundles.

When

cambium is present

, the vascular bundle is described as

open

and when the

cambium is absent

, the

vascular bundle is described as closed.Slide18

Vascular Tissue System

A vascular bundle may contain either only xylem or only phloem or both

. Slide19
Slide20

Xylem tissue is found in the vascular bundle in the stem. It is also found throughout the plant.Slide21

Ground Tissue System

It is a derivative

of ground meristem.

It is represented by the different regions in the plant body that are mainly involved in storage. Slide22

In the cylindrical parts of the plant body such as root and stem, the ground tissue becomes differentiated into various regions.

In a typical condition, following regions can be recognised in the ground tissue.

Hypodermis

Cortex

Endodermis

Pericycle

Medullary rays

Pith

Ground Tissue System