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1. Review How are tissues distributed in plant roots 2. Apply Concepts Why is it important that the root endodermis permits only a one way passage of materials.

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Presentation on theme: "1. Review How are tissues distributed in plant roots 2. Apply Concepts Why is it important that the root endodermis permits only a one way passage of materials."— Presentation transcript:

1 1. Review How are tissues distributed in plant roots 2. Apply Concepts Why is it important that the root endodermis permits only a one way passage of materials 3. Classify Draw and label a diagram to show how roots absorb water and nutrients- also include a brief description

2 CH 23 PLANT STRUCTURE AND FUNCTION 23.2 Roots

3 Types of Root Systems  Taproot systems  Fibrous root systems.

4 Taproot Systems  Taproot  Long and thick primary root  Smaller branch roots  Mainly found in dicots.

5 Fibrous Root System  Many equally sized branch roots that grow separately from the base of the stem  Begins with one primary root  Help hold topsoil in place  Found mainly in moncots.

6 Root Tissues  Dermal tissue  Ground tissue  Vascular tissue  Apical meristem.

7 Dermal Tissue  Also called Epidermis  Protection  Absorption  Root hairs to increase surface area.

8 Ground Tissue  Cortex is one portion of ground tissue  Directly inside of epidermis  Water and minerals move through to get to center of root  Store photosynthesis products (starch).

9 Ground Tissue  Endodermis  Completely encloses the vascular cylinder  Plays essential role in moving water and minerals to the center of root.

10 Vascular Tissue  Vascular cylinder  Region made up of Xylem and Phloem.

11 Apical Meristem  Root cap  Protects meristem  Secrets slippery substance to help root move through soil  Cells constantly being scraped away and replaced.

12 Root Functions  Uptake nutrients  Transport nutrients  Support plant  Anchor in ground  Store nutrients.

13 Uptake Nutrients  Need inorganic nutrients  Also trace minerals.

14 Transport Nutrients  Active transport brings mineral ions across the epidermis  High mineral ions concentration causes water molecules to move into the plant by osmosis.

15 Transport Nutrients  Water and dissolved minerals pass through the cortex and move toward the vascular cylinder.

16 Transport Nutrients  Vascular cylinder is enclosed by the endodermis and a special waterproof zone called a Casparian strip.

17 Casparian Strip  Forces water and minerals through the cell membranes of the endodermis rather than in between the cells  Controls water and minerals entering vascular cylinder doesn’t allow to leak back out.

18 Root Pressure  Water is forced in by osmosis due to active transport of minerals  Water enters through casparian strip and is forced up.

19 Root Pressure  Glass tube replaced stem and leaves of carrot.


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