Pyramids Of Biomass And Numbers Flashcards
0
Q
How does a pyramid of biomass work?
A
Each bar shows mass of living material for each stage of food chain.
Check diagram p.76
1
Q
What happens to energy, biomass, and number of organisms as you move up the trophic level?
A
All decrease
2
Q
Why can it be difficult to construct an accurate pyramid of biomass
A
Measured as dry biomass (dry out animals!)
Some organisms feed at more than one level eg. eat ladybirds and aphids
3
Q
How is a pyramid of biomass different in shape from pyramid of numbers?
A
Biomass always pyramid shape
Numbers can be small at bottom, eg 1 pear tree feeds 3000 aphids
