Form and Structure SWBAT explain the key parts of the definition for plant; list plant organs; compare tap and fibrous root systems; distinguish between woody and herbaceous stems; identify and describe the parts of a leaf

Form and Structure Morphology –The shape or form of an organism Anatomy –Deals with how cells and tissues are put together

Form and Structure What are the four most common plant organs? –Roots –Stems –Leaves –Flowers Node –The region where a leaf is or was attached

Root Systems Root system –All the roots of a plant Taproot system –One or a few main roots that are longer and thicker than the other roots of a plant Lateral roots –Smaller roots that branch off from the main root Can you think of some plants that would have taproot systems? –Carrots –Dandelions

Root Systems Fibrous root system –Cluster of roots that are about equal in size Can you think of some plants that have fibrous root systems? –Grass –Ferns –Most trees

Types of Stems Woody stems –Stems that are hard and not very flexible. They can support a lot of weight. Herbaceous stems –Stems that are softer and more flexible. Turgor pressure helps support these stems.

Leaf Characteristics Blade –The flat, green part of a leaf Veins –Water and sugar conducting tissues

Leaf Characteristics Parallel venation –Leaves in which the larger veins are parallel to each other Palmate venation –Leaves in which the veins branch away from the base of the leaf Pinnate venation –Leaves with one main vein with smaller ones branching sway from it

Leaf Characteristics Petiole –The part of a leaf between the node and the blade Alternate leaf arrangement –One leaf attached at each node Opposite leaf arrangement –Two leaves are attached at each node Whorled arrangement –Three or more leaves at each node