just as important as stems and leaves…. major functions: 1. serve as an anchor 2. conduct...
TRANSCRIPT
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Just as important as stems and
leaves…. Major Functions:
1. Serve as an anchor 2. Conduct nutrients and water 3. Store food(ex. sweet potatoes, carrots, radish, turnip, beet)
Roots
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Root Functions
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Root Development Primary root develops from
the embryo
1. If primary root becomes the main root=Taproot System
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Root Development 2. If primary root stops growing
early on and new roots grow from the stem, it is a Fibrous Root System
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Fibrous vs. Taproot
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Root Hairs Grow from
epidermal cells of roots
Only occur in first ¼ of root tip
Only live about 10 days
Absorb water and nutrients from soil particles
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Function of Root Hairs
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Root Hairs
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Specialized Roots
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Food Storage Roots Most roots store some
food
Some are enlarged to store starch and other carbohydrates
Examples: sweet potato, carrot, beet, radish
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Produced by plants in arid regions Can be quite large (159 lbs.!) Examples: Manroot
Water Storing Roots
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Grows close to ground: perennial vineRoots can be several meters long and
over 100lbs.
Manroot
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Extend above the surface of water
for plants that grow in swampy areas
Helps roots exchange gases
Example: Mangrove
Pneumatophores
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Mangrove
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Roots that occur above the surface of the soil Examples: prop roots in corn (support in high
wind)
Aerial Roots
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Adventitious roots in ivy for
climbing
Aerial Roots Continued
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Poison Ivy
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Contractile Roots Help to pull the plant deeper
into the soil
Occurs from year to year
Examples: Lily, Dandelion
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Peg-like projections penetrate
host’s stem Usually in plants that do not
contain chlorophyll (can’t make food)
Examples: pinedrops, dodder (one organisms benefits, one is
harmed)
Parasitic Roots
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Pinedrops
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—Not green!
Dodder: NO Chlorophyll
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Huge roots near base of
trunk Usually in trees that grow in
shallow soil Rainforest environmentsExample: many tropical trees
Buttress Roots
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Buttress Roots
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Buttress Roots
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Dicot Root Tip
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Cross Section of Root
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Modified Stems/Roots
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