Biology 22 4[1]
Transcript of Biology 22 4[1]
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.