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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