Students will be able to know the 3 different types of roots systems and identify them by

going outside.

Root System Video http://youtu.be/vz7a-d-AKcs

ORGANSORGANS - have

one or more FUNCTIONS and composed of SEVERAL TISSUES

ROOTS are the simplest

FUNCTIONS of ROOTSANCHORAGE

FUNCTIONS of ROOTSABSORBING and

CONDUCTING Water and NutrientsImportant for

Perennials

FUNCTIONS of ROOTSFOOD STORAGE

TaprootsFascicled roots

FUNCTIONS of ROOTSFOOD STORAGE in Cortex

CLASSIFICATION of ROOTSBased on where

they originate

PRIMARY First seedling root

SECONDARY Branches off primary

or secondary roots ADVENTITIOUS

Arises from another plant part

CLASSIFICATION of ROOTSBased on TYPE of

ROOT SYSTEM

TaprootFibrousFascicled

Tap Roots Primary root is DOMINANT

DEEP, non-branching rootsGood ANCHORINGCan be ENLARGED for STORAGE DIFFICULT to TRANSPLANT – easily damaged

Example: Carrots, dandelions, conifers

Fibrous Roots Primary and secondary roots DEVELOP

EQUALLY SHALLOWER, SPREADING rootsGood EROSION CONTROL - large surface area

to capture water and soilEASY to TRANSPLANT

ALL ADVENTITIOUS root systems are FIBROUS

Examples: Sod, Rhododendrons

Fascicled or Tuberous Roots Fibrous root system used to STORE FOODExamples: Dahlia, Sweet potato

Assignment Make the following chart

Go outside and dig up roots of weeds for examples of fibrous (grass), tap roots (dandelion), and fascicled (dahlia). 5 fibrous and tap roots, 1 fascicled

Plant Root System (Name)

Draw a Picture of the Root System

OSMOSIS LAB You need the following:

2 white cupsWater 1 rib of lettuce Food coloringCutting device

You will need to make observations of your plants before and after the labWhat color is the leaf, How much color is left in the

water, ect Complete lab

Root Anatomy MATURATION REGION

DIFFERENTIATION taking placeFormation of SPECIALIZED tissues

ELONGATION REGION Elongation PUSHES root into soilNo differentiation

Root Anatomy MERISTEMATIC REGION – Apical Meristem

Divides both waysROOT CAP

PROTECTS young growing tip

ROOT PHYSIOLOGYWater and Nutrient

CONDUCTION is comprised of THREE ACTIONS

ROOT PRESSURECAPILLARITYTRANSPIRATION

ROOT PRESSUREOSMOSIS

Water seeks to equalize concentration in cells of root compared to pores in soil

Pathway A – Intercellular Spaces

Pathway B –

Root Hairs

CAPILLARY ACTION Chemical property of water due to the

POSITIVE & NEGATIVE CHARGES on the WATER MOLECULEAdhesion- attraction of 2 different substance Cohesion- attraction of 2 alike substances

TRANSPIRATION TRANSPIRATIONAL

PULLAs WATER

EVAPORATES or DIFFUSES from the surface of a leaf, and as cells replace water , the continuous loss of water PULLS it up through plant

HOMEWORKcolor pages 11-14

SPECIALIZED ROOTS and ASSOCIATIONSPROP ROOTS

Added Support Corn and Tropical Plants

SPECIALIZED ROOTS and ASSOCIATIONS

CLIMBERSClimbing trees and walls Ivy

SPECIALIZED ROOTS and ASSOCIATIONSPNEUMATOPHORES (U-Met-A-Fors)

Roots grow from stem into air to provide anchoring and aeration in swampy soils

Bald Cypress

SPECIALIZED ROOTS and ASSOCIATIONSEPIPHYTES

grow above ground on trees without soilhang on trees by rootsabsorb moisture from airsome photosynthesizeOrchids, mosses, lichens, and licorice fern

SPECIALIZED ROOTS and ASSOCIATIONSCONTRACTILE ROOTS

Contract or expand to pull bulb into soil for correct depth

lily, freesia bulbs

SPECIALIZED ROOTS and ASSOCIATIONSPARASITIC ROOTS

Penetrate host for water and sometimes nutrients

Mistletoe, Dodder

SPECIALIZED ROOTS and ASSOCIATIONS

SUCKERS roots that have adventitious buds that form

new plantsBlackberries, raspberries, oaks

Assignment You will create a collage of all 7 root systems You need to have the following:

Root nameRoot descriptionRoot examples (5)Roots pictures

It must be colored and creative