L2 | SEEDS

• SEEDS

  • Mature ovule (botanically)
  • Form of reproduction for plants
  • Small structure that contains everything needed to give rise to a new plant.
• CONDITIONS REQUIRED FOR GROWTH

  1. GOOD QUALITY SEED
  2. MOISTURE
  3. WARMTH
  4. NUTRIENT RICH SOIL
  5. SUNLIGHT
• STAGES:

  1. Tiny seed planted
  2. First sign of growth is a tiny root
  3. The embryo starts growing
  4. Growing plant bursts open through the seed coat in search of sunlight.
  5. Once the seed coat falls off, the root starts growing downwards to anchor the seed.
  6. The shoot starts growing upward towards the light.
• MONOCOT (CORN SEED)

  A) ENDOSPERM

  B) EMBRYO

  C) EPICOTYL

  D) HYPOCOTYL

  E) RADICLE

  F) SEED COAT

  G) COTYLEDON

  
• DICOT (BEAN SEED)

  A) EMBRYO

  B) EPICOTYL

  C) HYPOCOTYL

  D) RADICLLE

  E) COTYLEDON

  F) SEED COAT

  
• PARTS OF A SEED

  1. PLUMULE
  2. RADICLE
  3. COTYLEDON
  4. SEED COAT
  5. EPICOTYL
  6. HYPOCOTYL
• PLUMULE

  • First shoot 
• RADICLE

  • First root
• COTYLEDON

  • Food store
  • Seed leaves
• SEED COAT

  • Protective layer
• GERMINATION

  • Start of growth of a plant from seed
  • Process by which an organism grows from a seed or spore
  • Sprouting of a seedling from a seed of an angiosperm or gymnosperms
• WHAT SEEDS NEED TO GERMINATE

  1. WATER
  2. OXYGEN
  3. WARM TEMPERATURE
• WATER

  • Dormant seeds are dry but the chemical reactions for growth and development can only take place in a solution where molecules are free to move.
• OXYGEN

  • Growth and development needs energy and this is released through respiration 
• • GLUCOSE - From the cotyledon
  • OXYGEN - From the air

  
• WARM TEMPERATURE

  • Living organisms require enzymes. 

  1. HOT - Enzymes destroyed
  2. WARM - Just right
  3. COLD - Molecules move too slowly
• FLORAL PARTS

  1. MALE PART
  2. STAMEN
  3. ANTHER
  4. FILAMENT
  5. FEMALE PART
  6. PISTIL
  7. STIGMA
  8. STYLE
  9. OVARY