(a)[1]
State one source of methane gas.
(b)[3]
Complete the sentences to describe the changes in methane concentration shown in Fig. 8.1.
(c(i))[1]
State one process, other than respiration, that releases carbon dioxide into the atmosphere.
(c(ii))[2]
State two effects on the environment of increasing carbon dioxide and methane concentrations in the atmosphere.
(c(iii))[1]
State one natural process that removes carbon dioxide from the atmosphere.
(d(i))[1]
State the name of the process used by yeast to produce ethanol.
(d(ii))[3]
Describe the disadvantages of growing crop plants such as maize in a large-scale monoculture.