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Slide 1: Reproduction in Flowering Plants A collection of slides to teach Key Stage 2 Science Unit 5B Life Cycles. Children will learn to name and explain the functions of some parts of a flower; describe the processes of pollination, fertilisation, seed dispersal and germination. © Diane Hawkins Clipart from Printmaster Gold and graphics by kind permission from PC Advisor 10,000 Clipart March 1999 Cover CD ROM
Slide 2: The Parts of a Flower • Most flowers have four parts: • sepals, • petals, • stamens, • carpels.
Slide 3: The parts of a flower • Sepals protect the bud until it opens. • Petals attract insects. • Stamens make pollen. • Carpels grow into fruits which contain the seeds.
Slide 4: Stamen (male) • Anther: pollen grains grow in the anther. • When the grains are fully grown, the anther splits open.
Slide 5: Pistil (female) • • • • Stigma Style Carpel (ovary) Ovules (eggs)
Slide 6: Pollination • Flowering plants use the wind, insects, bats, birds and mammals to transfer pollen from the male (stamen) part of the flower to the female (stigma) part of the flower.
Slide 7: Pollination • A flower is pollinated when a pollen grain lands on its stigma. • Each carpel grows into a fruit which contains the seeds.
Slide 8: Fertilisation • Pollen grains germinate on the stigma, growing down the style to reach an ovule. • Fertilised ovules develop into seeds. • The carpel enlarges to form the flesh of the fruit and to protect the ovary.
Slide 9: Wind pollination • Some flowers, such as grasses, do not have brightly coloured petals and nectar to attract insects. • They do have stamens and carpels. • These flowers are pollinated by the wind.
Slide 10: Seed dispersal Seeds are dispersed in many different ways: • Wind • Explosion • Water • Animals • Birds • Scatter
Slide 11: How birds and animals help seed dispersal • Some seeds are hidden in the ground as a winter store. • Some fruits have hooks on them and cling to fur or clothes.
Slide 12: How birds and animals help seed dispersal • Birds and animals eat the fruits and excrete the seeds away from the parent plant.