DP Biology (first assessment 2025)

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Question 23M.2.SL.TZ2.3

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Date May 2023 Marks available [Maximum mark: 4] Reference code 23M.2.SL.TZ2.3
Level SL Paper 2 Time zone TZ2
Command term Predict, State, Suggest Question number 3 Adapted from N/A
3.
[Maximum mark: 4]
23M.2.SL.TZ2.3

The light micrograph shows tumour tissue from a patient’s lung.

[Source: Nephron, 2012. Lung carcinoid – very high mag. [image online] Available at: https://commons.wikimedia.org/wiki/
File:Lung_carcinoid_-_very_high_mag.jpg [Accessed 18 October 2021]. Public domain.]

(a)

State one cause of lung cancer.

[1]

Markscheme
  1. smoking/tobacco;
  2. passive smoking;
  3. Radon/other radiation;
  4. exposure to arsenic/asbestos/smoke from coal burning/fires/silica/rock dust/vehicle exhaust fumes/nitrogen oxides;

 

(b)

Suggest one difference between tissue taken from a lung cancer tumour and normal lung tissue that might be seen in micrographs.

[1]

Markscheme
  1. fewer/smaller/lack of alveoli/air spaces;
  2. many cells/nuclei per area / much denser tissue;
  3. more cells undergoing mitosis (in the tumour);

 

(c)

The lung tumour in the light micrograph was slow-growing. Predict with a reason what would have been visible in the micrograph if the tumour was growing rapidly.

[2]

Markscheme

See

a. more mitosis
OR
cells in prophase/metaphase/anaphase/telophase;

Why

b. more dividing cells/tumour cell divide uncontrollably
OR
a higher mitotic index;

 

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