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Seeds - PowerPoint PPT Presentation


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Seeds. What are seeds?. Original Power Point Created by Darrin Holle Modified by Georgia Agricultural Education Curriculum Office June 2002. Basic Parts of Seeds. 1. Embryo 2. Food Supply 3. Ovary wall or seed coat. Germination. Needed for Germ 1. Temperature 2. Moisture 3. Air

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seeds

Seeds

What are seeds?

Original Power Point Created by Darrin Holle

Modified by Georgia Agricultural Education Curriculum Office

June 2002

basic parts of seeds
Basic Parts of Seeds
  • 1. Embryo
  • 2. Food Supply
  • 3. Ovary wall or seed coat
germination
Germination
  • Needed for Germ
  • 1. Temperature
  • 2. Moisture
  • 3. Air
  • 4. Light or absence of it
germination1
Germination
  • Process
  • 1. Seed absorbs water
  • 2. Seeds proteins activated
  • 3. Radicle (root) emerges
germination2
Germination
  • 4. Plumule or embryonic shoot emerges
  • 5. Leaves form and food production begins
monocot seeds
Monocot Seeds
  • 1. Seed coat-protection
  • 2. Endosperm- a source of energy
  • 3. Embryo-miniature plant that has
monocot seeds1
Monocot Seeds
  • 3.Embryo:
    • Epicotyle-shoot above cotyledon
    • Hypocotyl-part of stem below the cotyledon
    • Radicle- primary root, supports seedling
dicot seeds
Dicot Seeds
  • 1. Seed Coat-protection
  • 2. Embryo miniature plant
dicot seeds1
Dicot Seeds
  • 2. Embryo-
    • 2 cotyledons-seed leaves
    • Epicotyl-true leaves
    • Hypocotyl-first stem, pulls seed upward
    • Radicle-forms roots
monocot germination
Monocot Germination
  • 1. Seed swells
  • 2. Radicle grows down
  • 3. First internode and epicotyl grows upward
monocot germination1
Monocot Germination
  • 4. New leaves form and food production starts
  • 5. New root system develops
  • 6. Temporary root system ceases to function and dies
dicot germination
Dicot Germination
  • 1. Seed swells
  • 2. Radicle grows down
  • 3. Hypocotyl forms arch that breaks soil surface
dicot germination1
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