1. Unit 3 Lesson 8 Leaf Functions and Structures
11/9/2018
Unit 3, Lesson 8, Leaf Structures and Functions

2. Unit 3, Lesson 8, Leaf Structures and Functions
Functions of the Leaf
The most important function of the leaf is to manufacture food for the plant by using light energy
Photosynthesis:
Phototropism:
11/9/2018
Unit 3, Lesson 8, Leaf Structures and Functions

3. Internal Leaf Structure
Stomata:
Guard Cells:
Cuticle:
Upper Epidermis:
Lower Epidermis:
11/9/2018
Unit 3, Lesson 8, Leaf Structures and Functions

4. Internal Leaf Structure
Palisade Mesophyll:
Vascular Bundle:
Xylem:
Phloem:
Spongy Mesophyll:
11/9/2018
Unit 3, Lesson 8, Leaf Structures and Functions

5. External Leaf Components
Define or list the functions of each of the following external leaf components:
Midrib:
Lamina:
Petiole:
Stipule:
Ligule:
Auricle:
Sheath:
SIMPLE LEAF
GRASS LEAF
11/9/2018
Unit 3, Lesson 8, Leaf Structures and Functions

6. Types of Veins Found in Leaves
Parallel-Veined Leaves: Grasses, have veins that run parallel to each other and are joined by inconspicuous tiny veins.
Net-like veined leaves: a few prominent veins with a large number of minor veins. Built like spider webs, out from midrib. Includes all crops other than grasses.
11/9/2018
Unit 3, Lesson 8, Leaf Structures and Functions

7. Unit 3, Lesson 8, Leaf Structures and Functions
LEAF ARRANGEMENTS
11/9/2018
Unit 3, Lesson 8, Leaf Structures and Functions

8. Unit 3, Lesson 8, Leaf Structures and Functions
Leaf Arrangments
Palmately Compound: Blade divided into leaflets, , leaflets coming from one point and only dividing once.
Pinnately Compound: Blade divided into leaflets, leaflets coming from more than one point, dividing again.
Bipinnately Compound: Blade divided inot leaflets, leaflets coming from more than one point, dividing two more times.
Alternate:
Whorled:
Opposite:
11/9/2018
Unit 3, Lesson 8, Leaf Structures and Functions

9. Internal Leaf Structure Assignment
In order to help you understand the internal structure of a leaf, you are going to create your own leaf. The following are some guidelines. Presentations will take place on _______.
“Leaf” must be in actual leaf shape.
Inner “leaf” structure must be made of at least five edible components (Twizzlers, rice, etc.)
“Leaf” must include the following: Cuticle, upper epidermis, palisade mesophyll, vascular bundle, xylem, phloem, lower epidermis, spongy mesophyll, guard cells, and stomata.
Must work with a partner.
All presentations must be completed on assigned date.
Presentations will be graded on:
Creativity
Accuracy
Description of structure functions
Inclusion of all structures
11/9/2018
Unit 3, Lesson 8, Leaf Structures and Functions

10. Can You Identify These Leaves?2 1 3 4
11/9/2018
Unit 3, Lesson 8, Leaf Structures and Functions