BY5.3 Flower Structure

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Plant Reproduction

flowering plants are called angiosperms

flower structure:

  • diploid
  • meiosis occurs to produce haploid spores
  • meiosis in the anther occurs to produce pollen which contains hapolid gametes
  • ovules are made in the ovary, the female gametes develop inside the ovule
  • pollen grains are transferred from one plant to the female part of a plant in the same species - this is known as pollination
  • pollen grains: tough resistant wall to prevent it from drying out during transfer
  • male and female gametes fuse during fertilisation
  • fertilised ovule becomes the seed
  • the structure of the plant depends on the pollination method

Insect pollinated plants:

(http://www.biosci.ohio-state.edu/~plantbio/osu_pcmb/pcmb_lab_resources/images/pcmb102/angio_life_cycle/flower_anatomy_2_labeled.jpg)

Sepal:

  • green
  • protect the flower bud

Petals:

  • brightly coloured
  • scented
  • produce nectar

Stamens:

  • consists of an anther and a filament
    • anther:
      • produces pollen
      • made up of four pollen sacs in pairs, side by side
      • when mature, the sac splits to release pollen
    • filament:
      • contains vascular tissue that transports material neccessary for the production of pollen

Carpel:

  • closed structure in which the ovule develops
  • consists of an ovary, a style and a stigma
    • ovary:
      • lower part that surrounds the ovule

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