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This presentation was produced and is copyrighted by Stewart-Peterson® Inc. 2003-2011. Permission is granted for use by active AgEdNet.com®

subscribers. All other use is prohibited. STEWART-PETERSON and AGEDNET.COM are registered trademarks of Stewart-Peterson Inc.

This presentation was produced and is copyrighted by Stewart-Peterson® Inc. 2003-2011. Permission is granted for use by active AgEdNet.com®

subscribers. All other use is prohibited. STEWART-PETERSON and AGEDNET.COM are registered trademarks of Stewart-Peterson Inc.

Learning Targets Learning Targets

Students will be able to: 1. Explain what a leaf is and its parts. 2. Know the difference in compound and

simple leaves.3. Explain how to identify leaves from other

ways.

Leaves – the real work horses:Leaves – the real work horses:Main function: to make food and other

chemicals needed for growth and reproduction

Where Photosynthesis takes place

ARS photo.

Why do leaves turn colors? Why do leaves turn colors?

The chlorophyll dries up Give it its color change

Leaf Parts Leaf Parts Margin Vein Blade PetioleMidrib

Main leaf parts:Main leaf parts:Blade:

broad, thin part of the leaf

NRCS graphic

Main leaf parts:Main leaf parts:Petiole:

narrow cylindrical part, may not be apparent

Main leaf parts:Main leaf parts:Margin:

Edge of leafMargin

Leaf Margins Leaf Margins Entire

Smooth margins Wavy

Waved margins Serrate

Sharp margins Angular Sharp

Wavy sharp margins Lobed/Notched

Open loops

Main leaf parts:Main leaf parts:Veins:

Structural framework of the leaf

Leaf Veins Leaf Veins Venation (veins) – parallel, pinnate,

palmate, forked

U.S. Geological Survey drawings

Main leaf parts:Main leaf parts:Midrib:

Large center vein Midrib

2 types of leaves:2 types of leaves:Simple

leaf with one bladeExamples: grasses,

oak, apple

Compound

several leafletsMay be joined to the

petiole or along the central axis of the leaf.

U.S. Geological Survey graphics

Leaves and Branching Patterns Leaves and Branching Patterns Alternate

Leaves alternate each other

OppositeLeaves are opposite

each otherWhorled

Leaves in a swirl pattern

Questions????Questions????

Leaf Assignment Leaf Assignment Copy down the following chart, leave

space between each line:Drawings

Leaf Type Compound LeafAlternating Branch Opposite Branch Whorled Branch Entire Leaf Margin Wavy Leaf Margin Serrate Leaf Margin Angular Sharp Leaf Margin Lobed/Notched Leaf Margin Parallel Vein Pinnate Vein Palmate Vein Simple Leaf

Drawings Examples

Cont……Cont……

Define each word on the left sideDraw a picture in the middleGive an example on the right side

Leaf Assignment Example Leaf Assignment Example

Leaf Type Compound Leaf

Drawings ExamplesWhite Oak

Ticket out the Door Ticket out the Door

Get out a piece of paper and write your name on it

Answer the following questions: 1. Write 3 things that you learned 2. Write 2 things that you found interesting 3. Write 1 thing that you have questions about