Upload
carter-blevins
View
231
Download
4
Tags:
Embed Size (px)
Citation preview
Plant Parts - StemsPlant Parts - StemsThe plant’s inner highwayThe plant’s inner highway
2001 AgriTeach.comTM (12901ms)
Why do plants have stems?Why do plants have stems?
They have two functions:They have two functions: moving materials (water, minerals, food)moving materials (water, minerals, food) supporting the rest of the plantsupporting the rest of the plant
The stem has rings called “nodes”The stem has rings called “nodes” the space in-between is called the the space in-between is called the
“internode”“internode” At each of the nodes is a “bud”At each of the nodes is a “bud”
Stem Anatomy - ExternalStem Anatomy - External
Stem Anatomy - InternalStem Anatomy - Internal
When a plantlet develops from a seed, it may When a plantlet develops from a seed, it may have have oneone or or twotwo seed leaves or seed leaves or “cotyledons”“cotyledons” Plants with Plants with oneone are are “monocots”“monocots”
• Grasses - lawn grasses, corn, wheat, etc.Grasses - lawn grasses, corn, wheat, etc. Plants with Plants with twotwo are are “dicots”“dicots”
• Other plants - trees, beans, alfalfa, etc.Other plants - trees, beans, alfalfa, etc. Both types have different arrangements of Both types have different arrangements of
their their “vascualar bundles”“vascualar bundles”• These are the These are the veins and arteriesveins and arteries of the plant of the plant
Vascular BundlesVascular Bundles
Vascular BundlesVascular Bundles The arrangement of the bundles:The arrangement of the bundles:
Allows Allows dicotdicot stems to grow thicker & taller stems to grow thicker & taller• Trees have active, living tissue around the Trees have active, living tissue around the outsideoutside
of the trunk; inactive heartwood on the of the trunk; inactive heartwood on the insideinside. . • To make syrup, we tap the outside because it is To make syrup, we tap the outside because it is
busy moving sap (nutrients).busy moving sap (nutrients). Limits Limits monocotsmonocots to a certain size to a certain size
Inside the bundles:Inside the bundles: xylemxylem tissue moves materials tissue moves materials upup the plant the plant phloemphloem moves materials moves materials downdown the plant the plant
Plant Parts - RootsPlant Parts - Roots
Functions of the RootsFunctions of the Roots
Anchor the plantAnchor the plant Absorb water and Absorb water and
nutrientsnutrients
Different Types of RootsDifferent Types of Roots
Tap Roots – one main rootTap Roots – one main root Ex. CarrotsEx. Carrots Function – storage of excess foodFunction – storage of excess food
Fibrous Roots – branched rootsFibrous Roots – branched roots Spread out in the soil in search of water and Spread out in the soil in search of water and
nutrientsnutrients Root Hairs – tiny hair-like rootsRoot Hairs – tiny hair-like roots
Absorbs much of the water and nutrients for Absorbs much of the water and nutrients for the plant.the plant.
Parts of a seedParts of a seed
Embryo - develop into all the different Embryo - develop into all the different tissues that will ultimately make up the tissues that will ultimately make up the mature plant mature plant
Seed Coat - protects the internal parts of Seed Coat - protects the internal parts of the seed the seed
Endosperm - serves as a food source for Endosperm - serves as a food source for the developing embryothe developing embryo
Parts of the SeedParts of the Seed
endosperm
GerminationGermination
* When a seed sprouts and begins to grow
Monocot vs. DicotMonocot vs. Dicot
Dicot Germination Monocot Germination