DP Biology (last assessment 2024)

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Question 23M.3.HL.TZ2.a

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Date May 2023 Marks available [Maximum mark: 2] Reference code 23M.3.HL.TZ2.a
Level HL Paper 3 Time zone TZ2
Command term State Question number a Adapted from N/A
a.
[Maximum mark: 2]
23M.3.HL.TZ2.a

State two variables measured by the probes.

1: 

2: 

[2]

Markscheme
  1. temperature;
  2. pH;
  3. minerals / salt concentration / conductivity;
  4. O2 (concentration);
  5. CO2 (concentration);
Examiners report

Most candidates could state two variables measured by probes, but many stated variables that could either not be measured by probes, e.g., movement of the snails, or variables that would be present outside the water, e.g., humidity.

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