A-Level Biology Specification

Edexcel B 9BI0

Section 10.1: The nature of ecosystems

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#10.1i

Understand what is meant by the term ecosystem and that they range in size.

#10.1ii

Understand what is meant by trophic levels.

#10.1iii

Understand the advantages and disadvantages of pyramids of numbers, biomass (dry) and energy as useful representations of ecosystem structure and how biomass and energy are transferred within them.

#10.1iv

Know the ecological techniques used to assess abundance and distribution of organisms in a natural habitat, including types of quadrat, transects, ACFOR scales, percentage cover and individual counts.

#10.1v

Be able to select appropriate ecological techniques according to the ecosystem and organisms to be studied.

#10.1vi

Be able to use statistical tests to analyse data, including t-test and Spearman rank correlation coefficient.