DP Biology (last assessment 2024)

Test builder »

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

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

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.i)

Outline how factor Y affects the species from January to April.

[2]

Markscheme

a. limited effect on low/stable population size from January to March
OWTTE.

b. large effect increases population size from March to April 
OWTTE.

c. niche conditions decrease from January to March 

d. niche conditions improve from March to April

Syllabus sections