Complexity and Shapes of LeavesAGR 161: Unit C

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Created By: Jennifer Stewart

Objectives Recognize the complexity of Leaves Identify leaf shapes

Epidermis Cuticle

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

Principal Tissues of the Leaf

Epidermis (cont) Stomata

Openings in the epidermis mainly located on underside of leaves

Exchange of gases

Principal Tissues of the Leaf

Principal Tissues of the Leaf

Epidermis (cont) Guard Cells

Two cells located on each side of stomata Open and closes stomata Allows gas exchange

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

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

Principal Tissues of the Leaf

simple leaf = 2 parts (leaf blade and petiole)

Petiole

Leaf

Blade

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

Compound leaf: leaf blade divided into leaflets

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

Palmately compound

What are the different types of compound leaves?

Pinately compound

What are the different types of compound leaves?

What are the different types of compound leaves?

Trifoliate (alfalfa)

Shape and size of leaves vary among plants used for

identification of plants

Review What is the

difference between a simple leaf and a compound leaf?

Review

What type of compound leaf is this?

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?