Complexity and Shapes of Leaves AGR 161: Unit C

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Complexity and Shapes of LeavesAGR 161 Unit C

• Found on Internet Unknown Source
• Created By Jennifer Stewart

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Objectives

• Recognize the complexity of Leaves
• Identify leaf shapes

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Principal Tissues of the Leaf

• Epidermis
• Cuticle
• Waxy substance covers the leaves and stems
• Waterproof layer that keeps water in plants

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Principal Tissues of the Leaf

• Epidermis (cont)
• Stomata
• Openings in the epidermis mainly located on
  underside of leaves
• Exchange of gases

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Principal Tissues of the Leaf

• Epidermis (cont)
• Guard Cells
• Two cells located on each side of stomata
• Open and closes stomata
• Allows gas exchange

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Principal Tissues of the Leaf

• Mesophyll layer
• Palisade mesophyll
• Primary site of photosynthesis
• Spongy mesophyll
• Contains air and chloroplasts
• Site of photosynthesis and gas exchange

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Principal Tissues of the Leaf

• Veins or vascular bundles
• In spongy mesophyll
• Phloem tissues conduct food from photosynthesis
  to rest of plant
• Xylem tissues conduct water and minerals up to
  cells in leaves and stems

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What is the difference between a simple leaf and
a compound leaf?

• simple leaf 2 parts (leaf blade and petiole)

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What is the difference between a simple leaf and
a compound leaf?

• Compound leaf leaf blade divided into leaflets

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What are the different types of compound leaves?

• Palmately compound

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What are the different types of compound leaves?

• Pinately compound

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What are the different types of compound leaves?

• Trifoliate (alfalfa)

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Shape and size of leaves

• vary among plants
• used for identification of plants

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Review

• What is the difference between a simple leaf and
  a compound leaf?

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Review

• What type of compound leaf is this?

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Review

• What are the three parts of the epidermis?
• What is the cuticle?
• What are the guard cells?
• What are the three different leaf shapes?