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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,

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Presentation on theme: "  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,"— Presentation transcript:

1   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

2  Root Functions

3 Root Development  Primary root develops from the embryo  1. If primary root becomes the main root=Taproot System

4 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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7  Fibrous vs. Taproot

8 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

9  Function of Root Hairs

10  Root Hairs

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12 Food Storage Roots  Most roots store some food  Some are enlarged to store starch and other carbohydrates  Examples: sweet potato, carrot, beet, radish

13   Produced by plants in arid regions  Can be quite large (159 lbs.!)  Examples: Manroot Water Storing Roots

14  Grows close to ground: perennial vine Roots can be several meters long and over 100lbs. Manroot

15   Extend above the surface of water for plants that grow in swampy areas  Helps roots exchange gases  Example: Mangrove Pneumatophores

16  Mangrove

17   Roots that occur above the surface of the soil  Examples: prop roots in corn (support in high wind) Aerial Roots

18   Adventitious roots in ivy for climbing Aerial Roots Continued

19  Poison Ivy

20 Contractile Roots  Help to pull the plant deeper into the soil  Occurs from year to year  Examples: Lily, Dandelion

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22   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

23  Pinedrops

24  —Not green! Dodder: NO Chlorophyll

25   Huge roots near base of trunk  Usually in trees that grow in shallow soil  Rainforest environments Example: many tropical trees Buttress Roots

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28  Dicot Root Tip

29  Cross Section of Root

30  Modified Stems/Roots

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