Food chains Flashcards
1
Q
What is a food chain?
A
Shows what gets eaten by what in an ecosystem.
2
Q
What is a food web?
A
Shows all the food chains in an ecosystem.
3
Q
What are the benefits of a food web?
A
-Survive if one dies out
-Feed in different seasons
-Less competition for food
4
Q
What is a pyramid of numbers?
A
Each bar represents the number of organisms at each level in the food chain
5
Q
What is a pyramid of biomass?
A
Each bar represents
6
Q
How do you calculate biomass?
A
Number of organisms
x
Mean mass
7
Q
Why is energy lost between trophic levels?
A
-Not all of the organism is eaten
-Not all of the organism is digested
-Heat loss to surroundings
-Energy used up in reparation
8
Q
What is biomass?
A
The total mass of living organisms in a given area or volume.
