Leaf Structure.

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Presentation transcript:

Leaf Structure

Function of Leaves To carry out photosynthesis

How? They need to absorb carbon dioxide, water, and sunlight; and dispose of the products (glucose and oxygen) once they are made

Leaf Structure Blade: Fleshy part of the leaf Vein: Transports glucose and water; support Petiole: Stem of the leaf Midrib: Central rib of the leaf

What is a Cross Section?

Leaf Cross Section

A. Cuticle: Location Outermost layer on the surface of a leaf A. Cuticle: Function Non-cellular surface; waxy outer layer that prevents water loss A. Cuticle: Location Outermost layer on the surface of a leaf A

B. Upper Epidermis: Function Helps protect the internal tissues from damage; also transparent to allow sunlight to penetrate the leaf B. Upper Epidermis: Location First cellular level of the leaf on the top part an the bottom part of a leaf B

C. Palisade Mesophyll: Location Found beneath the upper epidermis; Vertically elongated cells C. Palisade Mesophyll: Function Contain large amounts of chloroplasts; where photosynthesis occurs in the leaf C

D. Vascular Bundle: Function Location of xylem and phloem; xylem transports the water and phloem transports glucose D. Vascular Bundle: Location Found within the mesophyll; typically in circles in the cross section D

E. Spongy Mesophyll: Location Found beneath the Palisade mesophyll; typically very spacious E. Spongy Mesophyll: Function The air spaces allow for the transport of gases in and out of the leaf E

F. Stomata: Function Allows water and gases to move in and out of the leaf F. Stomata: Location Found beneath on the lower epidermis on the underside of a leaf; appear as small pores/opening F