← Back to full paperPrevious questionNext question

Question 2

From Biology SL Paper 2 (November 2024, TZ2)

Grade your answerAnswer this question in practice mode and submit it for feedback.Practice under timed constraintsOpen the paper flow with timed full-exam navigation.
View source PDF page 2
  1. The micrographs show red blood cells which were placed in salt solutions of different concentrations.
Two micrographs, labeled A and B, showing red blood cells. Micrograph A shows normal-looking red blood cells, while micrograph B shows crenated red blood cells.
Two micrographs, labeled A and B, showing red blood cells. Micrograph A shows normal-looking red blood cells, while micrograph B shows crenated red blood cells.

(a) Deduce with a reason the change in salt concentration from A to B that would result in the red blood cells shown in the micrographs. [2]

(b) Suggest a reason that no cells can be seen when blood samples are placed in distilled water. [1]

Textbook topics in this question

Review the exact course sections assessed by each question part.

Mixed-topic question
2(a)6.2 Diffusion, Osmosis and Active Transport6.3 Water Potential and Osmotic Systems
2(b)6.2 Diffusion, Osmosis and Active Transport6.3 Water Potential and Osmotic Systems