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IB Biology HL 3.4.3 Abiotic Factors and Distribution Question Bank

Practise IB Biology HL 3.4.3 by interpreting abiotic responses and explaining how temperature, light and precipitation shape ecosystems.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Deduce species or ecosystem responses to temperature, light and other abiotic gradients.
  • Explain how abiotic conditions determine ecosystem type and succession patterns.

B4.1.3—Abiotic variables affecting distribution question 1

[Maximum number: 2]

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.

Figure for Question B4.1.3—Abiotic variables affecting distribution question 1 — IB Biology HL

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

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