K.C.S.E Biology Q & A - MODEL 2010PP2QN03
The diagram below represents a food web in a certain ecosystem.
(a) Name the trophic level occupied by each of the following:
(ii) small insects.
(b) From the food web, construct two food chains which end with lizards as a tertiary consumer.
(e) (i) Which organisms have the least biomass in this ecosystem?
(ii) Explain the answer in (c) (1) above.
(a) (i) Primary consumers;
(ii) Primary/secondary consumers;
(b) Green plants — Caterpillars — Lizards;
Decaying leaves —Caterpillars — small insects — Lizards;
(e) (i) Hawks;
(ii) At each trophic level energy is lost as heat in respiration; and during decomposition; lost in defecation/faeces/ waste products or metabolism/excretion; some parts of organism not eaten e.g. feathers;