1. L6: Plant Tissues and Organs
Learning Objectives:
Describe the main plant organs; flowers, leaves, stem, and roots.
Describe the structure and function of plant tissues:
Epidermal
Palisade mesophyll
Spongy mesophyll
Xylem
Phloem
Meristem

2. Plant Organs a) Flower – plant reproductive organ
Seed/Fruit – new plant (reproduction)
Leaf – photosynthesis
Stem – transport of water and nutrients
Roots – absorption of water and minerals b) c) d) e)

3. Plant Tissues (pg. 83) Epidermal Palisade mesophyll Spongy mesophyll
Xylem
Phloem
Meristem

4. Epidermal Tissue covers the entire plant

5. (Air spaces for gas diffusion)
Palisade Mesophyl
(Photosynthesis)
Spongy Mesophyl
(Air spaces for gas diffusion)

6. (transport of nutrients)
Xylem
(transport of water)
Phloem
(transport of nutrients)

7. (growing tips of shoots and roots, differentiate into other cells)
Meristem
(growing tips of shoots and roots, differentiate into other cells)

8. Leaf Function
Function: Photosynthesis Carbon Dioxide + Water  Glucose + Oxygen Photosynthesis converts light energy into chemical energy (food) for the plant.
light

9. Leaf Structure (pg. 83)

10. Vascular Bundle
(Xylem and Phloem)
Waxy cuticle
Upper Epidermis
Palisade Mesophyll
Air Space
Spongy
Mesophyll
Lower Epidermis
Waxy cuticle
Guard Cell
Stoma

11. Gas Exchange in Plants

12. Stoma (Stomata) Stomata are pores on the underside of the leaf.
They regulate gas exchange.

13. Guard Cells Open and close stomata depending on the water content of the leaf