During a 24 hour period, the carbon dioxide concentration in the air above a crop of maize plants was recorded. No wind was blowing throughout the 24 hours of the investigation. The findings are shown in Fig. 9.1.
(a(i))[1]
State the two times on Fig. 9.1 when the carbon dioxide concentration in the air was 37 arbitrary units.
(a(ii))[1]
Calculate the change in the carbon dioxide concentration in the air between 04:00 (sunrise) and 12:00 (midday) on Fig. 9.1.
(a(iii))[3]
Explain why the concentration of carbon dioxide falls between 04:00 and 09:00.
(b)[2]
State two environmental factors that would influence the results of this investigation.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “05:00 and 02:00” …