Which type of leaf is characterized by having only one true leaf without leaflets?

A leaf that is characterized by having only one true leaf without any leaflets is known as a simple leaf. This type of leaf consists of a single blade attached to a stem by a petiole. Examples of simple leaves include those found on maple trees, oak trees, and many other deciduous species.

In contrast, composite leaves consist of multiple leaflets that are attached to a single petiole, which would classify them as compound leaves. Deciduous leaves refer to trees and plants that shed their leaves annually, but this term does not specifically describe the leaf structure itself. Therefore, the defining feature of having a single, undivided blade makes simple leaves the correct identification in this context.