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Seed Dispersal Seeds Some guide questions: What is seed dispersal? • Why is seed dispersal important? • What are the different methods of seed dispersal? • Explain the relationship between the structure of the seed and its method of dispersal. • Seeds Seed Dispersal and Gemination 1 2 Seed Dispersal Seed Dispersal Seeds Seeds What is seed dispersal? Agents of Seed Dispersal — WIND Scattering of fruits and seeds to other places • New plants are formed • Factors that affect the growth of seeds: • Favorable Place • How it is scattered • • • Usually dry and light Some have wing-like structures Agents of Seed Dispersal Wind • Water • Animals • Some plants can disperse their own seed • 3 4 Seed Dispersal Seed Dispersal Seeds Seeds Agents of Seed Dispersal — WATER Fruits that float on water • Usually have waterproof coverings or fibrous husks that help them stay afloat • Agents of Seed Dispersal — ANIMALS Fruits that are eaten by animals • Seeds are thrown or passed out through feces • Some seeds have hooks or stiff hairs • 5 6 Seed Dispersal Germination Seeds Seeds Agents of Seed Dispersal — THEMSELVES Some fruits split open forcefully • Shoot their seeds away • 7 Germination • • Seeds begin to grow Put out shoots 8 Germination Germination Seeds Seeds Parts of a Seed Stages of Seed Gemination A. Cotyledon • Food storage B. Embryo • Baby plant C. Seed Coat • Protection Stage 1 — Plant starts with a seed • Stage 2 — Roots grow out and still needs nutrients from the seed leaves • Stage 3 — The shoot appears • Stage 4 — Development of leaves • 9 Germination Seeds Stages of Seed Gemination 11 10
