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KEY CONCEPT Seeds disperse and begin to grow when conditions are favorable.

KEY CONCEPT Seeds disperse and begin to grow when conditions are favorable. Animals, wind, and water can spread seeds. Seeds dispersed by animals can have nutritious fruits or fruits that cling. Cypselae. Double samaras. Seeds dispersed by wind can have wing- or parachute- like fruits.

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KEY CONCEPT Seeds disperse and begin to grow when conditions are favorable.

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  1. KEY CONCEPTSeeds disperse and begin to grow when conditions are favorable.

  2. Animals, wind, and water can spread seeds. • Seeds dispersed by animals can have nutritious fruits or fruits that cling.

  3. Cypselae Double samaras • Seeds dispersed by wind can have wing- or parachute-like fruits.

  4. Seeds dispersed by water can have fruits that float.

  5. Seed dormancy is a state in which the embryo has stopped growing. Seeds begin to grow when environmental conditions are favorable. • Dormancy may end when conditions are favorable. • While dormant, embryo can withstand extreme conditions.

  6. Germination begins the growth of an embryo into a seedling. • water causes seed to swell and crack coat • embryonic root, radicle, is first to emerge • water activates enzymes that help send sugars to embryo

  7. Germination begins the growth of an embryo into a seedling. water causes seed to swell and crack coat embryonic root, radicle, is first to emerge water activates enzymes that help send sugars to embryo • embryonic shoot, plumule, emerges next

  8. Germination begins the growth of an embryo into a seedling. water causes seed to swell and crack coat embryonic root, radicle, is first to emerge water activates enzymes that help send sugars to embryo embryonic shoot, plumule, emerges next • leaves emerge last

  9. Once photosynthesis begins, the plant is called a seedling.

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