Question 18M.2.HL.TZ1.b
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.2.HL.TZ1.b |
| Level | HL | Paper | 2 | Time zone | TZ1 |
| Command term | Suggest | Question number | b | Adapted from | N/A |
White-nose syndrome (WNS) is a disease caused by the fungus Geomyces destructans. This kills bats from many species during their winter hibernation Scientists used echolocation to record the number of bat flights over a station in 10 minute sample periods during the summers of 2007 to 2009. The graph shows the mean number of flights and number of recording samples for little brown bats (Myotis lucifugus), a species affected by the fungus, along with those of hoary bats (Lasiurus cinereus), which are not affected.
Suggest one limitation of this recording method in determining the accurate mean number of individual bats flying.
[1]
a. same bat may be recorded more than once
b. some bats may not fly over [the recording station]
OR
only bats flying over the station are recorded
c. two bats flying close/together might be recorded as one
