22-4 Seed Plants

Chapter 22 Plant Diversity

Gymnosperm

• Seed plant that bears its seeds directly on the surfaces of cones

Angiosperm

• Flowering plant; bears its seeds within a layer of tissue that protects the seed

Cone

• In gymnosperms, a seed-bearing structure

Flower

• Seed-bearing structure of an angiosperm

Pollen Grain

• Male gametophyte in seed plants

Pollination

• Transfer of pollen from the male reproductive structure to the female reproductive structure

Seed

• Embryo of a living plant that is encased in a protective covering and surrounded by a food supply

Embryo

• Organism in its early stage of development

Seed Coat

• Structure that surrounds and protects a plant embryo and keeps it from drying out

Key Concept

• Adaptations that allow seed plants to reproduce without water include flowers or cones, the transfer of sperm by pollination, and the protection of embryos in seeds.

Key Concept

• Gymnosperms include gnetophytes, cycads, ginkgoes, and conifers.