Download - Flowering Plant Sex
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Flowering Plant Sex
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PetalsStigma
Anther
FilamentOvary
Sepals
OvulesNectaries
Style
Label your diagram on your worksheet
Carpel
female parts
Stamen male parts
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What do the parts do?
Sepals- protect the flower when it is a bud
Petals- colourful to attract the insects
Nectaries- give out sugary liquid to attract insects
Stamen- anther produces male sex cells (pollen)
Carpel- stigma traps pollen
Style is where pollen tube grows down to female sex cells.
Carpel- ovary produces female sex cells (ovules)
Add these notes into your table on your worksheet
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Pollination
• Pollination involves the transfer of pollen (male gamete) from the anther to the stigma (outermost female part)
• If it is in the same flower it is calledself-pollination.
• If between different flowers it is calledcross-pollination
• Plants are pollinated by insects, wind, birds or animals
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Pollination
Pollination
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Sexual reproduction in flowers
Sexual reproduction in flowers
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Fertilisation
• Fertilisation involves the fusion of the nucleus of the male gamete (in the pollen) with the nucleus of the female gamete (in the ovules).
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Fertilisation
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• The pollen grain grows a tube.• The tube reaches an ovule.• The gamete nuclei fuse (fertilisation)
and a zygote (seed) forms.
Let´s have a look at some pollen tubes underneath the microscope!
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Fertilisation
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Fertilisation
Once fertilisation has taken place the zygote (fertilised ovule)becomes a seed, and the ovary becomes a fruit.The petals die and fall off.The plant seeds are in the fruit.
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Fruit Formation and Seed Dispersal
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Seeds must be carried away (dispersed / scattered) from the parent plant to:• Reduce overcrowding
Seed Dispersal- why?
• Reduce competition for:- Water- Light- Nutrients
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Learning about Seed Dispersal
Use the next few slides, the Blog link and the video clip to help you fill in the rest of your worksheet
relating to seed dispersal
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