Question 19M.3.SL.TZ1.2a.ii
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.SL.TZ1.2a.ii |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | Suggest | Question number | a.ii | Adapted from | N/A |
When feed for animals is stored, moisture levels need to be kept low to prevent the growth of fungi. Feed was exposed to 15 % moisture and placed into a respirometer. O2 consumption was monitored using the respirometer over a period of six days.
[Source: © International Baccalaureate Organization 2019]
Suggest one conclusion that can be drawn from the results shown in the graph.
[1]
a. as fungus grows, the rate of oxygen consumption increases ✔
b. around day 4/5 fungus begins to grow/no growth in days 1–3 ✔
c. the rate of fungus growth/rate of respiration is highest after 5 days ✔
Many candidates described what was shown by the graph rather than making a conclusion related to the growth of fungi. Thus “oxygen consumption increased after day 4” or references to the feed respiring were common answers.
