DP Biology (first assessment 2025)

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Question 21M.2.SL.TZ1.2c

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Date May 2021 Marks available [Maximum mark: 3] Reference code 21M.2.SL.TZ1.2c
Level SL Paper 2 Time zone TZ1
Command term Outline Question number c Adapted from N/A
c.
[Maximum mark: 3]
21M.2.SL.TZ1.2c
(c)

Outline how the compounds produced by chloroplasts are distributed throughout the plant.

[3]

Markscheme

a. in phloem ✔

b. loading into sieve tubes/by active transport/by cotransport/by companion cells ✔

c. entry of water (to phloem) by osmosis/because of high solute concentration ✔

d. causes high/hydrostatic pressure ✔

e. flow from high pressure to lower pressure down pressure gradient ✔ from source to sink ✔

Do not award mpa if xylem included with phloem.

Do not award a mark solely for mentioning the term ‘translocation'.

Examiners report

This question also required a link to be made, after which marks were relatively easily earned. The phase 'distributed throughout the plant' indicated that it was carbon compounds, not oxygen, that were the issue, so phloem transport was the distribution method expected. Transport of oxygen out through stomata and transport within leaf cells were not relevant to the question as asked. The average score was only 0.6 out of 3.

Syllabus sections