1. EQ: How do I describe the function of the stems and roots?
Page Number
Topic
Date
Stems and Roots
April 19
EQ: How do I describe the function of the stems and roots?

2. EQ: How do I describe the function of the stems and roots?
Two important functions
Carries substances between roots and leaves
Supports plant so leaves are exposed to the sun
EQ: How do I describe the function of the stems and roots?

3. Structure of a Stem Two types of stems
Herbaceous – soft and flexible
Woody-hard and rigid
Both types contain phloem and xylem

4. EQ: How do I describe the function of the stems and roots?
Woody Stems
EQ: How do I describe the function of the stems and roots?
Bark - added layer of protection
Heartwood – inner layers for additional support

5. EQ: How do I describe the function of the stems and roots?
Layers of a Woody Stem
Bark
Phloem
Cambium -cells that produce new phloem and xylem
Active xylem
Heartwood- inactive xylem
Pith – center of stem, stores food and water in young trees
EQ: How do I describe the function of the stems and roots?

6. EQ: How do I describe the function of the stems and roots?
Annual Rings
Represent one year in a tree’s growth
Made of xylem
Light rings grow in spring
Dark rings grow in summer
Two rings together make one year’s growth
EQ: How do I describe the function of the stems and roots?

7. EQ: How do I describe the function of the stems and roots?
Anchor plants
Absorb water and nutrients
EQ: How do I describe the function of the stems and roots?

8. EQ: How do I describe the function of the stems and roots?
Types of Roots
EQ: How do I describe the function of the stems and roots?
2 types
Taproot – long thick root with thin roots branching off – carrot, radish, dandelion, cactus
Fibrous- several main roots that branch repeatedly – lawn, corn, trees

9. EQ: How do I describe the function of the stems and roots?
Structure of Root
Root cap – contains dead cells, protects root from injury
Dividing cells – cause root to lengthen
Root hairs – grow out of root surface – increases the surface area of the roots
Cambium
Vascular tissue in center
EQ: How do I describe the function of the stems and roots?