DP Biology (first assessment 2025)

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Question 19N.1B.SL.TZ0.a

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.1B.SL.TZ0.a
Level SL Paper 1B Time zone TZ0
Command term Compare and contrast Question number a Adapted from N/A
a.
[Maximum mark: 2]
19N.1B.SL.TZ0.a

Compare and contrast the design of both mesocosms (vertical flow and horizontal flow).

[2]

Markscheme

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.

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