UNIT 8 REPRODUCING IN FLOWERING PLANT

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UNIT 8 REPRODUCING  IN FLOWERING  PLANT



8.1 PARTS OF FLOWER
  • The main parts of flower are female and male parts.
  • The female parts of flower are Stigma, Style, and Ovary.  
  • The male parts of a flower are anther or pollen head, filament or stalk.

 Image result for male and female flower parts
8.2 POLLINATION
  • Pollination: the transfer of pollen from the anther to the stigma of a flower.
  • Can come from same flower or different flower.
  • Flower that are pollinated by insects and birds are usually large and colorful.


8.3 FERTILIZATION

Image result for flower fertilisation
  • Pollen grains landed on stigma and produce pollen tube.
  • The tube grows down from stigma to the ovary which contain ovules. 
  • Inside each ovule is the egg cell.

The pollen tubes guides male reproductive cells to the ovules and fuse with the egg cells.

8.4 FROM FLOWER TO FRUIT
Image result for flower to fruit
  • The flower wither and drop off except for the ovary. 
  • The ovules start developing into seed.
  • The ovary enlarges and becomes a fruit. 
  • The ovary carries and protects the seed until they are ripe.


8.5 DISPERSAL OF FRUIT
Seeds must be scattered so that they can find a suitable place to grow. The scattering of seeds:
  • ·     Reduces the competition for resources between parent plant and the young plant.
  • ·     Prevent overcrowding plants.
  •      Fruits or seeds may be dispersed by animals, water, explosive action, and wind.

8.6 GERMINATION
Germination is a stage where plant wait for the right condition before developing into a new plant. A seed requires air, water, and warmth to germinate.

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