Fig. 1.1 presents a biomass pyramid together with a section of the carbon cycle. The diagram has these labelled parts: a box marked "CO2 in atmosphere"; four layered boxes marked A, B, C and D showing trophic levels; a box marked "decomposers"; a box marked "fossil fuels"; and arrows indicating transfers between the components. Arrow X shows movement from decomposers to CO2 in atmosphere.
(a(i))[1]
State the main source of energy needed for trophic level D of the pyramid of biomass in Fig. 1.1.
(a(ii))[1]
State the letter that shows the primary consumers in Fig. 1.1.
(a(iii))[1]
State how carbon moves from producers to primary consumers.
(a(iv))[3]
Explain why trophic level A is smaller than trophic level B in the pyramid of biomass in Fig. 1.1.
(b(i))[1]
Define the term decomposer.
(b(ii))[1]
State the name of process X.
(c)[5]
Describe how human activities are affecting the carbon cycle.
Worked solution & mark scheme
This 13-mark question has a full step-by-step worked solution and mark scheme. One marking point: “light / sun” …