Edexcel IAL Biology 5.16 Evidence for climate change

Identify the proxy or measured variable, calculate rates or differences with units and explain how the pattern supports environmental change without overstating causality.

Exam points

Use pollen or tree-ring evidence to infer past vegetation and climate conditions.
Calculate temperature, glacier or proxy changes as rates or differences with units.
Evaluate climate relationships by separating correlation from causal support.

[Maximum number: 4]

The graph shows the changes in mean temperature of the surface of the Earth from 1970 to 2017.

Change in mean temperature of the surface of the Earth/ ${ }^{\circ} \mathrm{C}$

Figure for Question 5.16—Evidence for climate change question 1 — Edexcel A-Level Biology A2

(a)

Studying the width of tree rings provides evidence for climate change.

[ 4 ]

(i)

Which of the following involves the study of tree rings?

dendrochronology

entomology

epigenetics

proteomics

[ 1 ]

(ii)

Explain why the width of tree rings produced in 1970 would be different from the width of tree rings produced in 2010.

[ 3 ]

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5.16—Evidence for climate change question 1

Question (a)

Question (i)

Question (ii)