flowering plant sex
DESCRIPTION
Flowering Plant Sex. Carpel female parts. Stigma. Petals. Stamen male parts. Style. Anther. Ovary. Filament. Ovules. Nectaries. Sepals. Label your diagram on your worksheet. What do the parts do?. Sepals- protect the flower when it is a bud. - PowerPoint PPT PresentationTRANSCRIPT
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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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