LESSON 2: THE LEAF

Photosynthesis

Plant leaves absorb sunlight to manufacture plant sugars through a process called.

Leaf Surfaces

_____ are flattened to have a big area.

The Blade

It is a thin expanded structure on either side of the midrib and is the largest part of the leaf.

Petiole

The leaf is attached to the stem by a _____.

node

The base of the petiole is attached to the _____ of the stem.

leaf axil

The node where a petiole meets a stem is called a _____.

axillary buds

The axil contains single buds or bud clusters, referred to as _____.

stipules

It is a pair of appendages at the base of the petiole called _____.

young

Stipules protect the _____ leaf.

Spines or Tendrils

Stipules may be modified into _____.

Simple Leaves

Type of Leaves that have a single blade.

Compound

Type of Leaves that have more than one blade on a single petiole.

Leaflets

The multiple blades of a Compound leaf are called.

Petiolate

Type of Leaf Attachemnt which the blade is attached to the stem by a petiole

Sessile

Type of Leaf Attachment which the blade is attached directly to the stem without a petiole.

Opposite

Type of Leaf Arrangement which two leaves grow opposite each other at each node.

Alternate

Type of Leaf Arrangement which one leaf grows at each node. The leaves alternate sides along the stem.

Whorled

Type of Leaf Arrangement in which several leaves grow around a single node.

Linear

Type of Leaf Shape which narrow from base to tip.

Elliptic

Type of Leaf Shape which is oval-shaped.

Ovate

Type of Leaf Shape which is wide at the base and narrow at the tip.

Cardate

Type of Leaf Shape which is heart-shaped.

Palmate

Type of Leaf Shape which is deeply lobed like the fingers of a hand.

Entire

Type of Leaf Margin which the edge of the leaf is smooth.

Crenate

Type of Leaf Margin which the edge has rounded indentations.

Serrate

Type of Leaf Margin which the edge of the leaf is finely toothed.

Lobed

Type of Leaf Margin which the edge of the leaf is deeply indented.