Competition in plants and animals
Possible relationships between 2
organisms A and B
+ = ‘gain’
Organism A
- = ‘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