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Published byLindsay Terry Modified over 9 years ago
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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.
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Leaves – the real work horses: Main function: to make food and other chemicals needed for growth and reproduction Where Photosynthesis takes place ARS photo.
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Why do leaves turn colors? The chlorophyll dries up Give it its color change
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Leaf Parts Margin Vein Blade Petiole Midrib
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Main leaf parts: Blade: broad, thin part of the leaf NRCS graphic
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Main leaf parts: Petiole: narrow cylindrical part, may not be apparent
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Main leaf parts: Margin: Edge of leaf Margin
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Leaf Margins Entire Smooth margins Wavy Waved margins Serrate Sharp margins Angular Sharp Wavy sharp margins Lobed/Notched Open loops
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Main leaf parts: Veins: Structural framework of the leaf
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Leaf Veins Venation (veins) – parallel, pinnate, palmate, forked U.S. Geological Survey drawings
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Main leaf parts: Midrib: Large center vein Midrib
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2 types of leaves: Simple leaf with one blade Examples: grasses, oak, apple Compound several leaflets May be joined to the petiole or along the central axis of the leaf. U.S. Geological Survey graphics
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Leaves and Branching Patterns Alternate Leaves alternate each other Opposite Leaves are opposite each other Whorled Leaves in a swirl pattern
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Questions????
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Leaf Assignment Copy down the following chart, leave space between each line: Drawings Leaf Type Compound Leaf Alternating 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 DrawingsExamples
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Cont…… Define each word on the left side Draw a picture in the middle Give an example on the right side
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Leaf Assignment Example Leaf Type Compound Leaf DrawingsExamples White Oak
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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
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