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IB Biology SL 4.1.2 Population estimates with quadrats Question Bank

Practise IB Biology SL 4.1.2 by using quadrat data to estimate the abundance of organisms.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain how quadrats are used to estimate population size.
  • Calculate or interpret population estimates from sample data.

C4.1.2—Population size estimation question 1

[Maximum number: 1]

In an area of forest measuring 100 m by 100 m , samples were taken to estimate the number of silver maple (Acer saccharinum) trees in the forest. The number of trees counted in each of five areas of 400 m2400 \mathrm{~m}^{2} was recorded.

Figure for Question C4.1.2—Population size estimation question 1 — IB Biology SL

Approximately how many silver maple trees are in the 10000 m210000 \mathrm{~m}^{2} area of forest?

A

5

B

25

C

125

D

625

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