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Pearson Edexcel IAL Biology 4.18 Comparing biodiversity with index of diversity

Practise comparing habitat biodiversity using index of diversity formulae, species abundance tables and conclusions from D values.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
AS

Exam points

  • calculate index of diversity from N and n values, showing numerator and denominator steps
  • compare habitats by using D values to justify which has higher biodiversity

4.18—Comparing biodiversity with index of diversity question 1

[Maximum number: 4]

The photograph shows a species of fungus growing on a dead tree in a woodland habitat.

Figure for Question 4.18—Comparing biodiversity with index of diversity question 1 — Edexcel A-Level Biology AS

© www.pqpictures.co.uk / Alamy Stock Photo Wood contains a high proportion of lignin and cellulose. Fungi can break down molecules in wood by releasing extracellular enzymes.

Question (a)

(a)

A study compared the biodiversity of two woodland habitats. The index of diversity for habitat one was 4.2. The table shows the data obtained from habitat two.

Table for Question (a) — Edexcel A-Level Biology AS
[ 4 ]

Question (i)

(i)

An index of diversity (D) is calculated using the formula:

D=N( N−1)∑n(n−1)\mathrm{D}=\frac{\mathrm{N}(\mathrm{~N}-1)}{\sum \mathrm{n}(\mathrm{n}-1)}

Calculate the index of diversity for habitat two. Use the table and the formula to help you.

[ 3 ]

Question (ii)

(ii)

State which habitat has the higher biodiversity. Give a reason for your answer.

[ 1 ]
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