No, pine trees are not flowering plants.
There are actually two types of seed bearing plants. There are gymnosperms, where the seeds develop on a surface, such as a pine cone. Gymnosperms do not flower. Then there are angiosperms, where the seeds develop within an ovary. Angiosperms are what we commonly call flowering plants.
Pine trees are gymnosperms, so they only produce cones and never flowers. The cones work as the male and female parts of the tree. The long tubular parts are the male cones, and they are covered in pollen. The larger brown pine cone that we are used to seeing have seeds under each little prong of the cone. They are the female cone.
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