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IB Biology SL A3.1 Diversity of Organisms Questions

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

  • Explain how mutation, meiosis, recombination and sexual reproduction generate variation, and distinguish continuous from discontinuous variation using population data.
  • Classify organisms from shared morphology and labelled features, and apply binomial nomenclature and shared genus to infer relatedness.
  • Apply the biological species concept using interbreeding, fertile offspring, gene flow and genetic evidence, and evaluate its limits.
  • Calculate haploid, diploid and autosome numbers, compare chromosome numbers with complexity, and construct or interpret karyograms for sex and abnormalities.
  • Use genome, allele, gene-count and segmental-duplication data to explain shared traits, variation, genome size and why DNA amount need not track organismal complexity.
  • Explain how sequencing and bioinformatics identify genes and support whole-genome sequencing in diagnosis, research and prevention.

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

Question 1

[Maximum number: 1]

Which population group has the greatest variation in height?

Age group

Age group

Question 2

[Maximum number: 2]

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

Question 3

[Maximum number: 1]

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

Figure for Question 3 — IB Biology SL

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

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