19.2. Food chains and food webs
A subsection of Biology, 0610, through 19. Organisms and their environment
Listing 10 of 345 questions
For Examiner's Use shows the flow of energy through a natural ecosystem that is not used by humans at any of the trophic levels. The unit of energy flow is kJ per m2 per year. O N M P L 92 000 light 17 000 decomposers 51 000 24 000 The letters L to O represent the different trophic levels in the ecosystem. Name the first and third trophic levels, L and N. L N Suggest what is shown by the relative sizes of the boxes, L to O, in the energy flow diagram in . For Examiner's Use There are no predators in the ecosystem feeding on the animals in trophic level O. Suggest and explain why there are no predators in the ecosystem feeding on the animals in trophic level O. P in does not represent any organisms. Explain what P represents in the energy flow diagram. People who live near this ecosystem would like to use some of the organisms at trophic level M for food. Suggest and explain what might happen to the ecosystem if the people took too many of the organisms at trophic level M.
0610_s13_qp_31
THEORY
2013
Paper 3, Variant 1
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