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 called self-pollination. • If between different flowers it is called cross-pollination • Plants are pollinated by insects or the wind.
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Pollination
• Pollinationinvolvesthetransferofpollen(malegamete)fromtheanthertothestigma(outermostfemalepart)
• Ifitisinthesamefloweritiscalled self-pollination.
• Ifbetweendifferentflowersitiscalled cross-pollination
• Plantsarepollinatedbyinsectsorthewind.
Pollination
Pollination
Sexualreproductioninflowers
Sexualreproductioninflowers
Fertilisation
• Fertilisationinvolvesthefusionofthenucleusofthemalegamete(inthepollen)withthenucleusofthefemalegamete(intheovules).
Fertilisation
• The pollen grain grows a tube. • The tube reaches an ovule. • The gamete nuclei fuse (fertilisation) and a
zygote (seed) forms.
Let´shavealookatsomepollentubesunderneaththemicroscope!
Fertilisation
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.
Whatarefruitslike?The fruits can be:
- soft & fleshy
- hard & dry
• Write the names of as many fruit as you can think of as a group and write them on a card
• Stick them on the correct side of the class
• Everyone pick a fruit card and your job is to bring that piece of fruit in for next lesson!
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