Post on 01-Apr-2015
Competition in plants and animals
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’?
++ = Mutualism
+ - = predation / parasitism
PREDATOR - PREY RELATIONSHIPS
It’s been a bad day!
Yeah – and about to get
much worse..
+ 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