life cycle of plants

• Life cycle of Plants


  Various stages of plant life cycle
• Parts of a seed

  • Seed Coat
  • Endosperm / Cotyledon
  • Embryo
• Seed Coat


  Outer covering of a seed, tough and waterproof, covers and protects the embryo and the food supply
• Embryo


  Baby plant, grows out of the seed when it germinates
• Cotyledon


  Also called a seed leaf, contains all the food supply
• Seed Germination


  The process that causes a seed to begin to grow into a new plant
• Seed Germination


  When a seed is in the correct growing conditions, it will begin to grow roots and shoots
• Receptacle


  Part of a flower stalk where the parts of the flower are attached
• Sepal


  Outer parts of the flower that enclose a developing bud
• Petals


  Colourful and scented to attract the pollinators
• Stamen


  Pollen-producing reproductive organ of a flower
• Anther


  Produces pollen grains
• Filament


  Supports the anther
• Pistil


  Has three parts - stigma, style and ovary
• Stigma


  Sticky surface at the top of the pistil, traps and holds the pollen
• Style


  Tube-like structure that holds up the stigma
• Ovary


  Contains the ovules
• Pollination


  Transfer of pollen from the anther to the stigma
• Types of Pollination


  • Self pollination
  • Cross pollination
• Self pollination


  Transfer of pollen grains from the anther to the stigma of the same flower or another flower of the same plant
• Cross pollination


  Transfer of pollen grains from the anther of one flower to the stigma of another flower of the same kind
• Fertilization


  Pollen travels down the style into the ovary where it mixes with the eggs to produce new seeds
• Fertilization


  When the pollen mixes with the eggs to produce a new seed
• Ways pollen might be moved from anther to stigma


  • Flowers are scented and have attractive petals to attract insects
  • Pollen sticks to insects and as they move around the pollen sticks to the stigma
  • During windy days the pollen may get blown from the anther to the stigma