QCE Biology, Units 3 and 4.

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Question 1

Number of snails of each species counted in one rock pool
Species	Number of snails
Periwinkle	10
Nerite	6
Limpet	4

A student counted the snails in a rock pool on a reef flat near Townsville and recorded three species, shown in the table. Simpson's diversity index is SDI = 1 − Σn(n − 1) ÷ N(N − 1). What is the SDI for the rock pool?

Four topics, two papers

Built for QCE Biology Units 3 and 4 on the QCAA Biology 2025 syllabus: the four topics the external examination assesses.

Unit 3 Topic 1: Biodiversity and populations

Unit 3 Topic 2: Functioning ecosystems and succession

Unit 4 Topic 1: Genetics and heredity

Unit 4 Topic 2: Continuity of life on Earth

Paper	What it asks	Time
Paper 1	Multiple choice, single words, sentences or paragraphs, calculations and unseen stimulus on Units 3 and 4.	5 minutes perusal, 90 minutes working
Paper 2	A mix of question types on Units 3 and 4, with calculations and unseen stimulus (graphs, tables or diagrams).	5 minutes perusal, 90 minutes working

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