Seeds

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Seeds

• What are seeds?

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Basic Parts of Seeds

• 1. Embryo
• 2. Food Supply
• 3. Ovary wall or seed coat

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Germination

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

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Germination

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

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Germination

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

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Monocot Seeds

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

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Monocot Seeds

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

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Dicot Seeds

• 1. Seed Coat-protection
• 2. Embryo miniature plant

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Dicot Seeds

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

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Monocot Germination

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

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Monocot Germination

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

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Dicot Germination

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

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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