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IB Biology HL B4.1.3 Abiotic Variables Affecting Distribution Questions

Explore how abiotic gradients limit growth, activity and biomass, and use experimental evidence to deduce organism and ecosystem responses in IB Biology HL B4.1.3.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Identify abiotic factors such as water availability, light, salinity, soil pH or temperature that can change ecosystem productivity or species distribution.
  • Deduce organism or ecosystem responses to temperature and light gradients from experimental data, explaining how limiting conditions alter activity, growth or biomass.

IB Biology HL B4.1.3 Abiotic Variables Affecting Distribution Questions 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 IB Biology HL B4.1.3 Abiotic Variables Affecting Distribution Questions question 1 — IB Biology HL

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

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