22.3 Seed Dispersal and Germination TEKS 10B The student is expected to: 10B describe the interactions that occur among systems that perform the functions of transport, reproduction, and response in plants

22.3 Seed Dispersal and Germination TEKS 10B KEY CONCEPT Seeds disperse and begin to grow when conditions are favorable.

22.3 Seed Dispersal and Germination TEKS 10B Animals, wind, and water can spread seeds. Seeds dispersed by animals can have nutritious fruits or fruits that cling.

22.3 Seed Dispersal and Germination TEKS 10B Seeds dispersed by wind can have wing- or parachute- like fruits. Cypselae Double samaras

22.3 Seed Dispersal and Germination TEKS 10B Seeds dispersed by water can have fruits that float.

22.3 Seed Dispersal and Germination TEKS 10B Seeds begin to grow when environmental conditions are favorable. Seed dormancy is a state in which the embryo has stopped growing. –Dormancy may end when conditions are favorable. –While dormant, embryo can withstand extreme conditions.

22.3 Seed Dispersal and Germination TEKS 10B 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

22.3 Seed Dispersal and Germination TEKS 10B 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

22.3 Seed Dispersal and Germination TEKS 10B 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

22.3 Seed Dispersal and Germination TEKS 10B Once photosynthesis begins, the plant is called a seedling.