Trophic structure and productivity
Answers are for parents and teachers.
1
State the trophic level of each organism: wheat → mouse → snake → eagle.
Wheat – 1; mouse – 2; snake – 3; eagle – 4.
2
Gross primary production is 3100 and respiration 1200 g/m² per year. Find the net primary production.
1900
3
What is the role of the detritus chain in nature? Write two sentences.
It breaks down dead remains, returns matter to the cycle and maintains soil fertility.
4
Give two reasons for low productivity in the tundra.
Low temperature, short growing season, frozen soil and seasonally low light.
5
A forest with biomass 12 000 g/m² adds 1 200 g/m² a year. What percent of biomass is the annual growth?
10