DP Biology (first assessment 2025)

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Question 23M.2.SL.TZ2.20b

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Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.2.SL.TZ2.20b
Level SL Paper 2 Time zone TZ2
Command term State Question number b Adapted from N/A
b.
[Maximum mark: 1]
23M.2.SL.TZ2.20b

Nitrogen content was measured in leaves of insectivorous California pitcher plants (Darlingtonia californica) at five sites with different elevations above sea level along the California–Oregon border, USA. The bar chart shows the median of all measurements at each site.

[Source: Reproduced from Ellison, A.M. and Farnsworth, E.J., 2005. The Cost of Carnivory for Darlingtonia californica
(Sarraceniaceae): Evidence From Relationships Among Leaf Traits. American Journal of Botany 92(7), pp. 1085–1093,
with permission from Wiley.]

(b)

State the relationship between elevation and nitrogen concentration in leaves of pitcher plants.

[1]

Markscheme

the higher the elevation, the greater the nitrogen content
OR
positive relationship;

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