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