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THE LIFE CYCLE OF PLANTS
Flowering Plants reproduce by producing seeds or by vegetative reproduction, (cuttings, bulbs etc…)
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Flower cycle Pollen Ovules Pollination Plant - flower Fertilisation
Germination Seed Formation Dispersal
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Parts of the flower
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The corolla is made of the petals – they attract pollinators
The stamens are the male part of the flower – they are made of the anther and the filament. The anther makes the pollen. The carpel is the female part and made of the stigma, style and ovary. In the ovary are ovules which have the female egg cell.
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There are two types of pollination.
Cross pollination – when pollen goes from one plant to another of the same type. This kind of pollination results in stronger plants. Pollination is the transfer of pollen from the anther to the sticky stigma by wind, animals/insects or water. The other type of pollination is self pollination where the pollen goes from the anther to the stigma of the same plant. This can result in a genetically weaker plant
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These kinds of flower are wind pollinated
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Worker Honey Bee in the Field
As they fly from flower to flower, worker honey bees collect pollen grains and pack them onto their hind legs in special hair-fringed pockets known as pollen baskets (shown here holding a glob of yellow pollen on the hind leg). Nectar, the sweet liquid produced by flowers, is sucked into the honey stomach, an internal storage sac. In the hive, field bees deposit their pollen pellets into empty storage cells of the comb and regurgitate nectar to waiting hive bees. The hive bees mix some nectar with the pollen to make bee bread, a spoilage-proof larval food, and gradually concentrate the rest of the nectar into honey by dehydration.
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Butterfly Pollinating a Flower
Many species of butterflies eat plant nectar. When these butterflies land on a series of flowers in search of food, they brush their bodies against both male and female floral organs, inadvertently transferring pollen from one flower to another.
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Lesser Burdock Plant The lesser burdock plant has a fruit that is encased in a burr covered with hooks. These hooks enable the burr to easily attach to the fur of passing animals, which ensures wide-ranging dispersal of the seeds.
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