DP Biology (first assessment 2025)

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Question 19M.1B.SL.TZ2.12c

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.1B.SL.TZ2.12c
Level SL Paper 1B Time zone TZ2
Command term Analyse Question number c Adapted from N/A
c.
[Maximum mark: 2]
19M.1B.SL.TZ2.12c
(c)

E. modestus is an invasive barnacle while the others are native species. Analyse the data to show how it supports this statement.

[2]

Markscheme

a. native species/C. montagui and S. balanoides have niches that don’t overlap much / are distinct
OR
range of E. modestus overlaps with both native species ✔

b. niches of native species «which don’t overlap much» shows competition between native species
OR
E.modestus invades habitats of C. montagui/S. balanoides resulting in competition with «both» native species ✔

c. EM has a wide niche/higher tolerance/covers entire «intertidal» range making it easier to invade the habitat ✔

Examiners report

Candidates had difficulty finding data to support E.modestus being aninvasive barnacle in part (c).

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