Which terms correctly describe the basic parts of a leaf?

• A. Tip, base, margin
• B. Apex, blade, base
• C. Node, vein, lamina
• D. Petiole, midrib, abaxial

Answer: (A)

The basic external regions of a leaf described in everyday terms are the tip, the base, and the margin. The tip (often called the apex) is the farthest point from where the leaf attaches to the stem. The base is the part nearest the stem, where the leaf is attached. The margin is the outer edge of the leaf. These three terms are widely used across many plant types to describe the general shape and attachment of a leaf, making them the most universally applicable set of descriptors for its basic parts.

The other options bring in terms that describe either internal features or parts associated with the leaf’s stalk, or more specialized surfaces. For example, blade (or lamina) refers to the broad flat part itself, which is a more specific description of the leaf blade rather than a basic trio of external regions; a node is part of the stem, not a leaf; and abaxial describes a surface (the underside) rather than a part of the leaf’s exterior outline.