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Question 18M.3.HL.TZ2.16c.ii

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.HL.TZ2.16c.ii
Level HL Paper 3 Time zone TZ2
Command term Suggest Question number c.ii Adapted from N/A
c.ii.
[Maximum mark: 2]
18M.3.HL.TZ2.16c.ii

The model describes the fundamental and realized niches of a species of microscopic marine arthropod in the Northern hemisphere with respect to two different factors (X and Y). The abundance of the species is shown over twelve months. The fundamental niche is separated into five zones ranging from critical to optimal conditions. The population of the species in its realized niche each month is represented by an oval. The size of each oval shows the population abundance.

(c.ii)

Suggest, with a reason, what factor Y could be.

[2]

Markscheme

a. factor 
eg temperature.

b. explanation
eg as temperature increases in spring «March to April» so the conditions for the species are more favourable.

Syllabus sections