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1 of 34 © Boardworks Ltd 2007 Spreading seeds Will it grow? Making new plants Circle of life Review Contents Life cycles 1 of 34 © Boardworks Ltd 2007
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Spreading seedsWill it grow?Making new plants Circle of lifeReview
Con
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s Life cycles
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Look at these plants…
How did they grow their fruits?
What will happen to them?
Why are they important?
Spreading seeds
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Spreading seeds
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Spreading seeds
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Spreading seedsP
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Life cycles
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After seeds have been dispersed they start to grow a tiny root and a tiny shoot. We call this germination.Seeds will only germinate under certain conditions…
What do you think a seed really needs to germinate?Water? Light? Warmth?
Let’s plan a test to find out!
No! I refuse to start growing unless I have my own dressing room, all
my favourite foods, a personal assistant...
Will it grow?
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Will it grow?
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Will it grow?
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Will it grow?
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Will it grow?P
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Let’s take a closer look at the different parts of this flower.
The stigma issticky to keep holdof the pollen.
The stylesupports the stigma and connects it tothe ovary.
The ovary is where the ovules, or eggs, are.
The anther is thepart that makes the pollen.
The filamentholds up theanther.
The petals attract insects.
The sepal leaves protect the flower before it opens.
Making new plants
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There is something special about this flower; do you know what it is?
The flower has both male and female organs!
The stigma, style and ovary make up the female organ. This is called the carpel.
The anther and filament make up themale organ. This is called the stamen.
Making new plants
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Making new plants
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Insects are attracted to flowers by their bright colours, lovely smell and sweet tasting nectar.
Pollen from the stamen sticks to the insects and gets carried to other flowers. Pollen brushes off the insect and onto the carpel.
This is the process of pollination. Let’s see it in action!
Although they have male and female parts, flowers need to spread their pollen around to reproduce.
Making new plants
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The pollen gets stuck on the stigma. Then, the pollen grows atube down to the ovary. Fertilisation can now take place.
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Ple
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Circle of life
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Circle of life
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Circle of life
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It is important for animals and plants to reproduce. If they stopped reproducing, what do you think would happen?
I’m a dodo bird. You might not have heard
of me because my species died out over 300 years ago. We used to roam free on our very own island but
then sailors discovered the island. They ruined our home and killed us for food. There weren’t many
of us left to reproduce and so we sadly became
extinct.
Circle of life
Eventually they would all die out.
