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Seed Plants Lab

CC BY Lynette Hauser, Tidewater Community College

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Seed Plants Lab

  1. 1. Seed Plants • Plants that contain seeds – Gymnosperms – Angiosperms • Sporophyte dominant
  2. 2. Seed plant spores • Microspores (male) undergo mitosis to create pollen • Megaspores (female) undergo mitosis to create egg
  3. 3. Alteration of Generations
  4. 4. Gymnosperms • Produce “naked seeds” (seeds with no fruit) • Four groups – Confers, ginkgos, cycads, gnetophytes • Conifers (pine, spruce, evergreen) largest group – Specimens today
  5. 5. Gymnosperm life cycle
  6. 6. Male and Female pine cones Female Male
  7. 7. Angiosperms • Means “vessel seed” • Plants with seeds, fruits, and flowers • Reproduction: Double fertilization – One sperm fertilizes egg (n) other sperm fertilizes n+n (polar nuclei) – Forms endosperm (3n) nutritive tissue • Two groups: Monocots and Eudicots • Monocot: one seed leaf • Eudicot: 2 seed leaves
  8. 8. Flower parts • Stamen is male, carpel is female • Look at model and dissect live flower
  9. 9. Anther slide Ovary/ovule slide
  10. 10. Embryo development • Fertilization creates embryo and endosperm tissue – Endosperm for nutrition • Enclosed in seed – Monocots have one cotyledon (seed leaf) – Eudocots have two cotyledons Seedcoat Endosperm Cotyledons Embryo
  11. 11. Fruits • Mature ovary – In terms of botany, peas, tomatoes, and beans are all fruits, not vegetables • Protects the seed • Helps in seed dispersal
  12. 12. Types of fruits • Simple: one ovary – Cherry, olive, tomato, grape • Complex fruits: more than one ovary – Aggregate: Many carpels on a single flower • Strawberry, raspberry – Multiple fruit: carpels of many flowers fused together • Pineapple • Can be fleshy or dry

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CC BY Lynette Hauser, Tidewater Community College

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