Option 1: Deciduous trees are the correct answer. These trees shed their leaves once a year during the fall season. They go through a process called leaf abscission, where the leaves gradually change color and eventually fall off. Deciduous trees include popular species such as oak, maple, and birch.

Option 2: Coniferous trees, such as pine and spruce trees, do not shed their leaves once a year. Instead, they have needle-like or scale-like leaves that stay on the tree throughout the year. These trees are adapted to colder climates and have leaves that are more resistant to harsh weather conditions.

Option 3: Evergreen trees, like coniferous trees, also do not shed their leaves once a year. They have leaves that remain green and functional throughout the year. Evergreen trees include species such as pine, cedar, and palm trees.

Option 4: This option is incorrect. Only deciduous trees shed their leaves once a year. Coniferous trees and evergreen trees do not shed their leaves in the same way.