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IB Biology SL 3.1.1 Variation as a Defining Feature of Life

Practise IB Biology SL 3.1.1 by identifying sources of variation and interpreting continuous traits and population data.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Identify mutation, meiosis and sexual reproduction as sources of variation within a population.
  • Interpret distributions and data to distinguish continuous variation from discrete categories.
  • Use graph or population evidence to compare variation between environments or groups.

A3.1.1—Variation as defining feature of life question 1

[Maximum number: 2]

Psammonobiotus balticus belongs to a group of protists (unicellular eukaryotic organisms) that have a shell surrounding most of the cell, which provides shelter from predators. The graph shows the frequency of varying shell lengths in a population of P. balticus.

Figure for Question A3.1.1—Variation as defining feature of life question 1 — IB Biology SL

State, giving a reason, the type of variation shown by shell length.

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