DP Biology (last assessment 2024)
Question 19N.3.SL.TZ0.b
| Date | November 2019 | Marks available | [Maximum mark: 1] | Reference code | 19N.3.SL.TZ0.b |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Suggest | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 1]
19N.3.SL.TZ0.b
An experiment was carried out on osmosis in carrot (Daucus carota) root tissue and potato (Solanum tuberosum) tuber tissue. Similar sized pieces of tissue were cut and soaked in different sucrose solutions for 24 hours. The results are shown in the graph below.
Suggest a reason for the difference in the isotonic points for the potato and the carrot tissues.
[1]
Markscheme
different dissolved solutes/sugars/sucrose/salts/molarities ✔
OR
may have been grown in different soils giving their tissues different contents ✔
OR
may have been stored under different conditions ✔
OR
may be more dehydrated / different water content ✔
OR
different types of tissue / different age ✔
Do not accept starch.
