| Date | November 2017 | Marks available | 1 | Reference code | 17N.1.HL.TZ0.02 |
| Level | Higher level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Deduce | Question number | 02 | Adapted from | N/A |
Question
[Source: Adapted from www.biology-resources.com. Copyright 2004–2017 D G Mackean & Ian Mackean. All rights reserved.]
The salt concentration inside the Paramecium is 1.8 %. The salt concentration in the surrounding medium suddenly drops to 0.2 %. What will be the likely response?
A. The cell will lose salt to the medium.
B. The contractile vacuole will expel more water.
C. The cell will swell and eventually burst.
D. The membrane will become more permeable to salt.
Markscheme
B
Examiners report
[N/A]
