Seeds

1. Seeds What are seeds?

2. Basic Parts of Seeds • 1. Embryo • 2. Food Supply • 3. Ovary wall or seed coat

3. Germination • Needed for Germ • 1. Temperature • 2. Moisture • 3. Air • 4. Light or absence of it

4. Germination • Process • 1. Seed absorbs water • 2. Seeds proteins activated • 3. Radicle (root) emerges

5. Germination • 4. Plumule or embryonic shoot emerges • 5. Leaves form and food production begins

6. Monocot Seeds • 1. Seed coat-protection • 2. Endosperm- a source of energy • 3. Embryo-miniature plant that has

7. Monocot Seeds • 3.Embryo: • Epicotyle-shoot above cotyledon • Hypocotyl-part of stem below the cotyledon • Radicle- primary root, supports seedling

8. Dicot Seeds • 1. Seed Coat-protection • 2. Embryo miniature plant

9. Dicot Seeds • 2. Embryo- • 2 cotyledons-seed leaves • Epicotyl-true leaves • Hypocotyl-first stem, pulls seed upward • Radicle-forms roots

10. Monocot Germination • 1. Seed swells • 2. Radicle grows down • 3. First internode and epicotyl grows upward

11. Monocot Germination • 4. New leaves form and food production starts • 5. New root system develops • 6. Temporary root system ceases to function and dies

12. Dicot Germination • 1. Seed swells • 2. Radicle grows down • 3. Hypocotyl forms arch that breaks soil surface

13. Dicot Germination • 4. Hypocotyl reaches light and straightens up • 5. Cotyledons turn green and make food • 6. As new leaves develop, cotyledons dry up and fall off