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Question 19N.3.HL.TZ0.3c

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.HL.TZ0.3c
Level HL Paper 3 Time zone TZ0
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 2]
19N.3.HL.TZ0.3c

An experiment was carried out to study osmosis in plant cells. Small cylinders of zucchini (Cucurbita pepo) were cut and placed in different sucrose solutions at 25 °C. The figure shows the percentage changes in mass after 24 hours.

(c)

Explain one reason for calculating the percentage changes in mass.

[2]

Markscheme

a. the change in mass indicates whether the tissue has gained/lost water ✔

b. the pieces of tissue will not all be the same mass «at the beginning of the experiment» ✔

c. to compare the relative changes in mass ✔

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