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A palmate leaf is characterized by having multiple leaflets that originate from a single point at the end of a central stalk or petiole, resembling the shape of a hand with fingers extending outward. This arrangement allows for a broad, collective structure of leaflets that can capture sunlight effectively.

The distinctive feature of palmate leaves is their radiating pattern, which not only provides aesthetic appeal but also maximizes photosynthetic efficiency. Such leaf forms can be commonly found in certain trees and shrubs, contributing to the unique identification of these plants. In contrast, other leaf arrangements described in the other choices do not fit this specific radial arrangement, helping to clarify why 'A' is the correct definition of a palmate leaf.