(a)[5]
Describe the harmful effects of acid rain on freshwater ecosystems, such as streams, rivers and lakes.
(b(i))[1]
Both groups of students chose sulfuric acid instead of hydrochloric acid to model acid rain in their investigation. Suggest why.
(b(ii))[1]
State how the students could have measured the pH of the sulfuric acid.
(b(iii))[2]
State two of these environmental conditions.
(c(i))[2]
Suggest why germinating seeds increase in temperature.
(c(ii))[1]
Explain why steam sterilisation would prevent seed germination.
(c(iii))[2]
Describe the results obtained by group 1.
(d)[1]
Suggest which Petri dish was not set up correctly.