Question 19N.3.HL.TZ0.a
| Date | November 2019 | Marks available | [Maximum mark: 2] | Reference code | 19N.3.HL.TZ0.a |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Compare and contrast | Question number | a | Adapted from | N/A |
Scientists have constructed systems to reproduce the conditions of natural wetlands. The mesocosms below were used to study nutrient removal from water flowing through.
[Source: © 2013. Silviya Lavrova and Bogdana Koumanova (October 2nd 2013). Nutrients and Organic Matter Removal in a
Vertical-Flow Constructed Wetland, Applied Bioremediation – Active and Passive Approaches, Yogesh B. Patil and
Prakash Rao, IntechOpen, DOI: 10.5772/56245. Available from: https://www.intechopen.com/books/applied-bioremediationactive-
and-passive-approaches/nutrients-and-organic-matter-removal-in-a-vertical-flow-constructed-wetland]
Compare and contrast the design of both mesocosms (vertical flow and horizontal flow).
[2]
Similarities [1 max]
a. both have similar design «input and output» ✔
b. both open systems ✔
Differences [1 max]
c. vertical flow/«figure» A has pump but horizontal flow/«figure» B does not/flows naturally ✔ Do not accept references to rate of flow or pressure as they are unknown.
d. horizontal flow/«figure» B has a larger «surface» area
OR
horizontal flow/«figure» B has more plants ✔ Accept vice versa.
e. vertical flow/«figure» A has a pre-treatment «with sedimentation tank» before treatment but not horizontal flow/«figure» B ✔ Accept vice versa.
