biology 22 4[1]
TRANSCRIPT
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22-4 Seed Plants
Chapter 22 Plant Diversity
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Gymnosperm
• Seed plant that bears its seeds directly on the surfaces of cones
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Angiosperm
• Flowering plant; bears its seeds within a layer of tissue that protects the seed
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Cone
• In gymnosperms, a seed-bearing structure
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Flower
• Seed-bearing structure of an angiosperm
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Pollen Grain
• Male gametophyte in seed plants
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Pollination
• Transfer of pollen from the male reproductive structure to the female reproductive structure
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Seed
• Embryo of a living plant that is encased in a protective covering and surrounded by a food supply
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Embryo
• Organism in its early stage of development
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Seed Coat
• Structure that surrounds and protects a plant embryo and keeps it from drying out
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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.
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Key Concept
• Gymnosperms include gnetophytes, cycads, ginkgoes, and conifers.