Competition in plants and animals Possible relationships between
Competition in plants and animals
Possible relationships between 2 organisms A and B Organism A + = ‘gain’ - = ‘lose’ Organism B O = ‘no effect’ + _ 0 + ++ +- +o _ x -- -o 0 x x oo Which one is ‘competition’?
++ = Mutualism
+ - = predation / parasitism
It’s been a bad day! Yeah – and about to get much worse. . PREDATOR - PREY RELATIONSHIPS
+ O = commensalism “nest sharing”
O O = cooperation
- - = competition
What do plants compete for? List three things… • LIGHT
What do plants compete for? List three things… • WATER
What do plants compete for? List three things… • MINERALS
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
Why have plants evolved different ways to spread their seeds? • To avoid competition between seedling and parent plant.
Give 3 adaptations of successful adaptations for spreading seeds • • Dandelion – fluffy parachutes Sycamore – wings Coconut – floats Cherry – sweet fruit
Competition in animals
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!
Game 2 – GRASS! • You have 2 minutes to list…. As many animals as possible that eat GRASS What did that tell you about ‘competition’? ?
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. . ?
Wild animals compete for: • • Food Water Mates Shelter
Competition can be between different species… • Eg? ?
Or within the same species…
Homework – competition in plants • HSW questions a-g • Page 93
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