germination

• conditions for germination experiment

  • water increases metabolic activity and swells up seed until seed coat bursts and embryo exits seed. experiment: dry cotton wool
  • oxygen for aerobic respiration for energy for germination. experiment: layer of oil (O2 can't pass) on top of boiled (anaerobic) and cooled water (denature enzymes)
  • warmth for enzymes. experiment: put in fridge
  • control setup: moist cotton wool
• germination - start of growth in seed into young seedling

  • plants have 1 or 2 cotyledons which contain food reserves which supply the young seedling with food
  • the cotyledons fulfil this role until the plant grows its own leaves for photosynthesis
  • after taking in water, the seed coat (testa) splits which leads to production of the plumule (first emerging shoot) and radicle (first emerging root)
• label

  A) testa

  B) embryo root

  C) micropyle

  D) cotyledon

  E) embryo shoot

  F) plumule

  G) radicle