DP Biology (last assessment 2024)
Question 17N.2.SL.TZ0.c
| Date | November 2017 | Marks available | [Maximum mark: 4] | Reference code | 17N.2.SL.TZ0.c |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Describe | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 4]
17N.2.SL.TZ0.c
Plants have widespread influences, from food chains to climate change.
Describe the process of peat formation.
[4]
Markscheme
a. formed from dead plant material/leaves/mosses/Sphagnum
b. formed in waterlogged sites/bogs/mires/swamps
c. where bacteria/fungi/saprotrophs are not active/are inhibited
d. organic matter not fully decomposed
e. «occurs» in acidic conditions
f. «occurs» in anaerobic conditions
Reject anaerobic respiration
g. «very» slow process/takes a long time
[Max 4 Marks]
