ConceptConceptDocsDocuments

IB Biology HL 3.4.4 Environmental Limits and Distribution Question Bank

Practise IB Biology HL 3.4.4 by evaluating how changing environmental factors and water pH can limit species distribution.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Deduce how a changing environmental factor alters population size or species distribution over time.
  • Evaluate pH evidence to judge whether water chemistry limits a species range.

B4.1.4—Range of tolerance of limiting factor 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 B4.1.4—Range of tolerance of limiting factor question 1 — IB Biology HL

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

All question bank results loaded