Q.Write any three differences between Angiosperm and Gymnosperm plants. OR Write any three differences between Non-chordates and Chordates.

Seed plants are exactly what the name suggests: plants that reproduce by forming seeds, rather than shedding naked spores the way mosses and ferns do. But not all seed plants keep their seeds in the same way, and that single difference is what splits them into two great groups. Learning to classify seed plants is really about learning to ask one clear question — is the seed left exposed, or is it wrapped up?

The two groups are the gymnosperms and the angiosperms:

• Gymnosperms are the naked-seeded plants. Their very name says it, from words meaning naked and seed. In them the ovules sit exposed on the plant, not enclosed inside any ovary wall, and they stay uncovered both before and after fertilisation. Because there was never an ovary around them, the seeds that form are also left bare. They are woody plants ranging from shrubs to giant trees like Sequoia, and familiar examples include Cycas, Pinus and Ginkgo. …