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Date November 2016 Marks available 2 Reference code 16N.3.SL.TZ0.13
Level Standard level Paper Paper 3 Time zone TZ0 / no time zone
Command term Evaluate Question number 13 Adapted from N/A

Question

The number of plants in two fields of approximately the same size was counted.

Compare and contrast the richness and the evenness of the two fields.

[2]
a.

A calculation of Simpson’s reciprocal index was undertaken on each field with the following results.

Evaluate these results.

[2]
b.

Markscheme

a. same richness as they have the same number of species/total of individuals

b. field 1 has more evenness as more even distribution of numbers among the species. Allow vice versa.

 

 

 

 

a.

a. the higher the number the more diverse/biodiverse is the field
OR

D = N ( N 1 ) n ( n 1 )

b. field 1 shows greater diversity/biodiversity (as it has a higher value)

b.

Examiners report

[N/A]
a.
[N/A]
b.

Syllabus sections

Option C: Ecology and conservation » Option C: Ecology and conservation (Core topics) » C.4 Conservation of biodiversity
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Option C: Ecology and conservation » Option C: Ecology and conservation (Core topics)
Option C: Ecology and conservation

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