PLANT SCIENCES

Leaves

BELLWORK:

“WHAT ARE THE FIVE MAJOR PARTS OF A

PLANT?”

SIMPLE LEAVES When the leaf blade is in one piece, it is

called simple.

Examples of plants with this type of leaf are corn, oak, and fig.

COMPOUND LEAVES When the leaf is made up of two or

more leaflets, it is called compound.

These leaves may be pinnately compound or palmately compound.

PINNATELY COMPOUND LEAVES Pinnately compound leaves have a

single stalk with many leaflets.

Examples of this kind of leaf are mesquite, rose, and pea.

PALMATELY COMPOUND LEAVES Palmately compound leaves are made

up of many leaflets, but all are attached to the stalk at one point.

Examples of this kind of leaf are the Virginia creeper, poison ivy

VENATION What is venation? The arrangement of veins in the leaves is

called venation. The two types are parallel and netted.

Parallel venation- veins run in the same direction. Example: most grasses.

Netted venation- veins that form a net. Examples: flowers, mulberry, cottonwood.

The two types of netted venation are pinnately and palmately

NAME THAT VENATION

Netted

Parallel

WHAT ARE THE DIFFERENT PARTS OF THE PLANT LEAF AND THEIR FUNCTION? Epidermal Cells- protects underlying cells from damage. Cutin/ Cuticle- layer of wax, keeps plants from drying out. Guard Cells- regulate the release of water and gasses. Stomata- opening in the leaf that allow gas exchange

and water movement. Palisade layer- rich in chlorophyll Spongy layer- cells that exchange gasses, border the

intercellular chamber. Vascular Bundle- vein system consisting of phloem and

xylem tissues. Phloem transports food from the leaf to other part of the plant, while the xylem transports water and dissolved minerals to the leaves.

Intercellular Chamber- allows for the free movement of water from cell to cell

TICKET OUT “Why do plants have leaves?”

Answer: leaves are the main source of energy for plants