AP BIOLOGY

Detailed explanation-1: -The flowering plants that bear seed but no fruits are called gymnosperms. Their seeds are thin and naked, not enclosed in fruits. Most gymnosperms are evergreen i.e. they do not shed all their leaves at one time. Some examples are pine, fir, cedar and spruce trees that grow in mountainous areas.

Detailed explanation-2: -Gymnosperms are seed-producing plants but they do not bear flowers.

Detailed explanation-3: -Non-flowering plants include mosses, liverworts, hornworts, lycophytes and ferns and reproduce by spores. Some non-flowering plants, called gymnosperms or conifers, still produce seeds.

Detailed explanation-4: -Angiosperms, also called flowering plants, have seeds that are enclosed within an ovary (usually a fruit), while gymnosperms have no flowers or fruits, and have unenclosed or “naked” seeds on the surface of scales or leaves. Gymnosperm seeds are often configured as cones.

Detailed explanation-5: -Gymnosperm seeds are usually formed in unisexual cones, known as strobili, and the plants lack fruits and flowers. Both groups use pollen to facilitate fertilization, though angiosperms have an incredible diversity of pollination strategies that are not found among the gymnosperms.