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IB Biology SL A3.1 Diversity of Organisms Question Bank

Practise IB Biology SL A3.1 with questions on classification, domains, kingdoms, biodiversity and the characteristics used to compare organisms.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • classify continuous or discontinuous variation using distributions and intermediate phenotypes
  • apply binomial names, shared traits and fertile-offspring evidence to species decisions
  • interpret chromosome counts, karyograms and genome-sequence evidence when comparing organisms

Covered syllabus points

A3.1.1—Variation as defining feature of lifeA3.1.2—Species as groups with shared traitsA3.1.3—Binomial systemA3.1.4—Biological species conceptA3.1.5—Difficulties in distinguishing speciesA3.1.6—Diversity in chromosome numbersA3.1.7—Karyotyping and karyogramsA3.1.8—Unity and diversity of genomes within speciesA3.1.9—Diversity of eukaryote genomesA3.1.10—Comparison of genome sizesA3.1.11—Whole genome sequencing

A3.1 Diversity of organisms 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 Diversity of organisms question 1 — IB Biology SL

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

A3.1 Diversity of organisms question 2

[Maximum number: 2]

List two anatomical features of humans that are characteristic of primates.
1.
2.

A3.1 Diversity of organisms question 3

[Maximum number: 1]

The image represents the structure of the enzyme Rubisco from common pea (Pisum sativum).

Figure for Question A3.1 Diversity of organisms question 3 — IB Biology SL

State the genus of the plant where this Rubisco is found.

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