Sexual Reproduction in Plants

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Sexual Reproduction in Plants

INSECT POLLINATED PLANT

(http://www.bbc.co.uk/gardening/images/gardening_with_children/flower_diagram.gif)

Pistil (Female) = Stigma, Style, Ovary 

Stamen (Male) = Anthers, Filaments

Carpel = Pistil + Receptable

POLLINATION

Is the process of introducing pollen grains (containing the male gametes) are brought into contact with the female part of the flower (carpel) 

Self-polinating plants have less genetic variation than plants pollinated by others, but still have genetic variation due to mutation

WIND POLLINATED PLANTS

(http://www.oldschool.com.sg/modpub/88623230747ad8d534f74b)

Ryegrass is one example of a wind-pollinated plant 

  • Z = Bracht (modified petal for protection)
  • Y= Feathery stigma (better capture of pollen in wind)
  • X = Ovary
  • W = Anthers (low hanging better exposure to wind and pollen in wind)

COMPARISON

  • Insect Pollinated
    • Stamen within and protected by petals
    • Have a nectary
    • Brightly coloured petals
    • Smooth stigma
    • Large Pollen
    • Hooks/Spikes on pollen to make it stick
    • Scented to attract pollinators
  • Wind Pollinated
    • Stamen hang outside corolla (petals)
    • No nectary 
    • Dull green or no petals
    • Feathery stigma to aid pollen capture
    • Smaller…

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