competition in plants and animals. possible relationships between 2 organisms a and b + = ‘gain’...
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Competition in plants and animals
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Possible relationships between 2 organisms A and B
+ = ‘gain’ - = ‘lose’O = ‘no effect’
Organism A
+ _ 0
Organism B
+ + + + - + o
_ x - - - o
0 x x o o
Which one is ‘competition’?
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++ = Mutualism
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+ - = predation / parasitism
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PREDATOR - PREY RELATIONSHIPS
It’s been a bad day!
Yeah – and about to get
much worse..
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+ O = commensalism
“nest sharing”
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O O = cooperation
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- - = competition
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What do plants compete for? List three things…
• LIGHT
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What do plants compete for? List three things…
• WATER
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What do plants compete for? List three things…
• MINERALS
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Give 2 ways a plant can overcome the problems of growing in the shade of another plant.
• Grow taller• Grow faster• Have shorter roots (to absorb water quicker)• Flower earlier in the season
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Why have plants evolved different ways to spread their seeds?
• To avoid competition between seedling and parent plant.
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Give 3 adaptations of successful adaptations for spreading seeds
• Dandelion – fluffy parachutes• Sycamore – wings• Coconut – floats• Cherry – sweet fruit
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Competition in animals
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Game 1 – SURVIVE!You need to collect a set of 4 cards
• SHELTER FOOD WATER MATE• Rules:• No swapping• No taking from others• Can only hold one of each kind• Sit down when you have survived!
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Game 2 – GRASS!
• You have 2 minutes to list….
As many animals as possible that eat GRASS
What did that tell you about ‘competition’??
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Game 3 – What are we competing for??
• You have 3 minutes to list…
As many types of competition from everyday life as you can…
Swap sheets with other groups to share ideas…
So what do wild animals compete for..?
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Wild animals compete for:
• Food• Water• Mates• Shelter
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Competition can be between different species…
• Eg??
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Or within the same species…
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Homework – competition in plants
• HSW questions a-g• Page 93