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IB Biology SL A Unity and Diversity Questions

Practise IB Biology SL A Unity and Diversity through questions on water, nucleic acids, cells, viruses, biodiversity, classification and evolution.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Compare biological molecules using structure, polarity, hydrogen bonding and biological function.
  • Interpret micrographs and scale data to identify cell structures and calculate magnification.
  • Classify organisms from variation, binomial names, karyograms and genome evidence.
  • Explain evolution and speciation using heritable variation, isolation and selection pressures.
  • Evaluate biodiversity loss and conservation using sampling, habitat change and restoration evidence.

Covered syllabus points

A1.1 WaterA1.2 Nucleic acidsA2.2 Cell structureA3.1 Diversity of organismsA4.1 Evolution and speciationA4.2 Conservation of biodiversity

Question 1

[Maximum number: 1]

The image shows the results of Griffith's experiment with S and R strains of Streptococcus pneumoniae in mice (Mus musculus).

Figure for Question 1 — IB Biology SL

What is an explanation for the results?

A

Mice vary in their resistance to bacteria.

B

The R strain and S strain mated.

C

R strain bacteria are more heat-stable than S strain.

D

DNA was transferred from heat-killed S cells to R cells.

Question 2

[Maximum number: 2]

Outline the cell theory.

Question 3

[Maximum number: 1]

Which population group has the greatest variation in height?

Age group

Age group

Question 4

[Maximum number: 12]

Question (a)

(a)

Draw a labelled diagram of a eukaryotic plant cell as seen in an electron micrograph.

[ 4 ]

Question (b)

(b)

Explain how the process of evolution occurs.

[ 8 ]
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