Complexity and Shapes of Leaves
AGR 161: Unit C
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Created By: Jennifer Stewart
Objectives


Recognize the complexity of Leaves
Identify leaf shapes
Principal Tissues of the Leaf

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

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

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

What is the difference between a
simple leaf and a compound leaf?

simple leaf = 2 parts (leaf blade
and petiole)
Leaf
Blade
Petiole
What is the difference between a
simple leaf and a compound leaf?

Compound leaf: leaf blade divided into
leaflets
What are the different types of
compound leaves?

Palmately compound
What are the different types of
compound leaves?

Pinately compound
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?