Plant Reproduction - PowerPoint PPT Presentation

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Plant Reproduction
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Plant Reproduction

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  1. Plant Reproduction Click to Enter

  2. Plant Reproduction Home Page 4 1 Seed dispersal Flower structure 5 2 Germination Pollination 3 6 Test Fruit development

  3. Flowers are the reproductive organs of plants Flower Structure Pollination Fertilisation Seed Dispersal Germination Test

  4. Click image to view a video on plant reproduction If the hyperlink does not work then copy and paste this url into a new browser window and you can watch the video then, url: http://vimeo.com/1594037?pg=embed&sec=1594037 Flower Structure Pollination Fertilisation Seed Dispersal Germination Test

  5. Flower structure stigma anther style carpel stamen filament ovary ovule petal sepal receptacle peduncle Flower StructurePollination Fruit Development Seed Dispersal Germination Test

  6. Structure and function of the flower stigma anther style carpel stamen filament ovary ovule petal sepal receptacle peduncle Flower Structure Pollination Fertilisation Seed Dispersal Germination Test

  7. Flower Structure Quiz • What is the name of the structure labelled X in the diagram? carpel sepal X stamen peduncle Flower Structure Pollination Fertilisation Seed Dispersal Germination Test

  8. Flower Structure Quiz • Where is pollen made? stigma sepal anther ovary Flower Structure Pollination Fertilisation Seed Dispersal Germination Test

  9. Flower Structure Quiz • Where is the ovule found in a flower? petals style nectary ovary Flower Structure Pollination Fertilisation Seed Dispersal Germination Test

  10. Flower Structure Quiz • Which parts of the flower are labelled below: X = style, Y = stigma X X = filament, Y = anther Y X = stigma, Y = style X = anther, Y = filament Flower Structure Pollination Fertilisation Seed Dispersal Germination Test

  11. Pollination The pollen grain contains the male sex cell (gamete) Flower StructurePollination Fertilisation Seed Dispersal Germination Test

  12. Pollination is the transfer of pollen from the anther to the stigma • This is an example of cross-pollination as the pollen travels from one flower to a different flower. This is desirable in plants as it promotes variation. Flower StructurePollination Fertilisation Seed Dispersal Germination Test

  13. Pollen can be carried between flowers by insects or by wind Flower StructurePollination Fertilisation Seed Dispersal Germination Test

  14. Insect-pollinated flowers are adapted to attract insects to them to enable transfer of pollen Pollen has barbs for hooking onto insect fur nectar and a scent present Anthers positioned to rub pollen onto insects Sticky stigma to collect pollen Brightly coloured petals Flower StructurePollination Fertilisation Seed Dispersal Germination Test

  15. Wind-pollinated flowers are different in structure because they do not have to attract insects to them but do need to be exposed to the wind. Pollen grains are very small and light. They occur in very large numbers Anthers are exposed to the wind so that pollen can easily be blown away Stigma are feathery to catch pollen carried on wind Petals are small and green as there is no need to attract insects No scent or nectary Flower StructurePollination Fertilisation Seed Dispersal Germination Test

  16. Self-pollination occurs when pollen falls from the anther onto the stigma of the same flower • Self-pollination is not desirable as it reduces variation Flower StructurePollination Fertilisation Seed Dispersal Germination Test

  17. Flowers will prevent self-pollination by either having stigma above stamen or… Flower StructurePollination Fertilisation Seed Dispersal Germination Test

  18. …by having stamen and stigma mature at different times. Flower StructurePollination Fertilisation Seed Dispersal Germination Test

  19. Click on the icons below to view the summary videos on pollination If the hyperlink does not work then copy and paste this url into a new browser window and you can watch the video then, url: http://www.youtube.com/watch?v=bZ3J4UWwd2Q Pollination (9 minutes) If the hyperlink does not work then copy and paste this url into a new browser window and you can watch the video then, url: http://www.youtube.com/watch?v=ge3EM8AERV0 Insect pollination (1 minute) Flower StructurePollination Fertilisation Seed Dispersal Germination Test

  20. Pollination Quiz • Pollination is the transfer from….? the stigma to anther style to stamen ovule to filament anther to stigma Flower StructurePollination Fruit Development Seed Dispersal Germination Test

  21. Pollination Quiz • The two mechanisms for pollination are? Wind and water Insect and wind Insect and water Wind and birds Flower StructurePollination Fertilisation Seed Dispersal Germination Test

  22. Pollination Quiz • Cross-pollination… Increases variation Decreases variation Is only performed by insects Is only performed by wind Flower StructurePollination Fertilisation Seed Dispersal Germination Test

  23. Pollination Quiz • Flowers are adapted for wind-pollination by… Having bright petals and a scent Having a nectary Having feathery stigmas Having sticky stigmas Flower StructurePollination Fruit Development Seed Dispersal Germination Test