IGCSE Chemistry

Wednesday, September 11, 2019

3.3 describe the structures of an insect-pollinated and a wind-pollinated flower and explain how each is adapted for pollination

Structure of a flower:














In summary:
A flower contains both male and female gametes. Stamen is the male reproductive part and Carpel is the female reproductive part.

Stamen: contains filaments and anthers.
Carpel: contains style, stigma, ovary.

Anther produces male gametes
Ovary contains female gametes


Pollination: the transfer of pollen from anther to stigma
Cross Pollination: when pollen is derived from another plant via insects or wind

Insect Pollinated Flower Adaptations:
1. Brightly coloured petals: attract insects
2. Sticky Stigma: insects can pass on pollen from other plants by sticking on it
3. Sticky Pollen grains: pollen can stick on insects as they go plant to plant.

Wind Pollinated Flower Adaptations:
1. Dull petals: it doesn't need to attract insects as they pollinate by wind.
2. Feathery stigma and long filament: catch pollen from other plants by wind
3. Small and light pollen grains: to be carried by the wind.



5 comments:

  1. shame and long fiber: get dust from different plants by wind . Little and

    light dust grains: to be conveyed by the breeze.

    ReplyDelete
  2. pollen from other plants by wind. Small and
    light pollen grains: to be carried by the wind.

    ReplyDelete
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