Question 21N.2.SL.TZ0.g
| Date | November 2021 | Marks available | [Maximum mark: 2] | Reference code | 21N.2.SL.TZ0.g |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Discuss | Question number | g | Adapted from | N/A |
The first study used mesocosms and the second study was carried out in natural grassland. Discuss the use of mesocosms as opposed to a study in a natural environment.
[2]
advantages of mesocosms/converse problems with studies in natural environments
a. easier to manipulate/control variables/conditions / less susceptible to outside influences
OR
easier to replicate
OR
take up less space;
disadvantages of mesocosms/converse opportunities with studies in natural environments
b. some trophic levels missing/incomplete food chains in mesocosms
OR
large animals cannot be included / ethical concerns about enclosing animals in mesocosms
OR
some variables lacking in mesocosms / doesn’t show what happens in natural ecosystems;
Allow only one mark for an advantage and one mark for a disadvantage as this is a discuss question.
Because this was a ‘discuss’ question, one mark was awarded for arguments in favour or mesocosms and one mark for counter arguments. The best answers weighed up the relative advantage of these two approaches, rather than just singing the praises of one of them.
