(a)[2]
State what the term ecosystem means.
(b(i))[1]
Name one group of organisms from Fig. 6.1 that are producers.
(b(ii))[1]
Name one group of organisms from Fig. 6.1 that are only secondary consumers.
(c)[3]
Explain why only a small percentage of the energy present at each trophic level is available to the organisms at the next level.
(d)[3]
Fig. 6.1 illustrates energy flow, but not nutrient cycling in the ecosystem. Outline what happens to the nitrogen-containing compounds in the organisms at the top of the food web.