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IB ESS HL 2.1.16 Quadrat Sampling Questions

Practise IB ESS HL 2.1.16 by planning quadrat surveys, measuring vegetation cover and comparing abundance along ecological gradients.

Syllabus
First assessment 2026
Course
ESS HL
Level
HL

Exam points

  • plan representative quadrat surveys for non-mobile organisms using random or systematic site selection
  • measure percentage cover, frequency, abundance or density in quadrats and compare estimates
  • strengthen quadrat reliability through replication, standardised measurements and adequate sample size
  • use quadrat data to assess invasive-species effects or vegetation change along an environmental gradient

IB ESS HL 2.1.16 Quadrat Sampling Questions question 1

[Maximum number: 3]
Figure 4(c): An example of a retreating glacier in the Swiss Alps, 1891 (left) and 2019 (right)

Figure:An example of a retreating glacier in the Swiss Alps, 1891 (left) and 2019 (right)

Figure 4(d): Average percent cover vegetation near a glacier

Figure:Average percent cover vegetation near a glacier

Describe a method used to collect the data on percent cover vegetation shown in Figure 4(d).

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