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Transcript of This presentation was produced and is copyrighted by Stewart-Peterson® Inc. 2003-2011. Permission...
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