DP Biology (last assessment 2024)

Test builder »

Question 19N.3.HL.TZ0.3b

Select a Test
Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.3.HL.TZ0.3b
Level HL Paper 3 Time zone TZ0
Command term Predict Question number b Adapted from N/A
b.
[Maximum mark: 1]
19N.3.HL.TZ0.3b

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.

(b)

If a zucchini is allowed to dry in the open air, predict how the osmolarity of the zucchini cells would change.

[1]

Markscheme

osmolarity will increase «because the cells become dehydrated»
OR
the cells become hypertonic ✔

Accept water potential of the tissue decreases.
Do not accept "change" instead of "increase".

Syllabus sections