Pollination

• Pollination

  • the transfer of pollen from an anther to a stigma.
• Types of Pollination

  1. Self-Pollination
  2. Cross Polination
• Self-Pollination

  • If the transfer or pollen grains take place within the same flower.
• Cross-Pollination

  • if the transfer of pollen grains takes place from one flower to another.
• Double Fertilization

  • after landing on a receptive stigma, a pollen grain absorbs moisture and germinates; that is, it produces a pollen tube that extends down between the cells of the style toward the ovary.
• Monoecious Plants

  • stamens and pistil occur on separate flowers but the same plant.
• Dioecious Plants

  • staminate and pistillate flowers occur on separate plants.
• The Angiosperm Life Cycle

  • Male Gametophyte
  • Inside the anthers' microsporangia, male gametophytes divide by meiosis to generate haploid microspores that undergoes mitosis and give rise to pollen grains.
• Pollen Grain contains two cells

  1. One generative cell
  2. Cell that will become the pollen tube cell.