Edexcel IGCSE Biology 2.80 Responses to Environmental Change Questions

Plan investigations of animal responses to smell or light, and use repeated-touch data to describe how a snail habituates and why.

Exam points

Design a fair smell- or light-response test using control groups, repeated trials and a measured outcome.
Describe how a snail’s response changes with repeated touches and explain the benefit of habituation.
Explain how a woodlouse reflex response helps it avoid predators by exposing only its hard shell.

[Maximum number: 1]

The diagram shows a food web from a woodland ecosystem.

Figure for Question Edexcel IGCSE Biology 2.80 Responses to Environmental Change Questions question 1 — Edexcel IGCSE Biology

Woodlice feed on dead and decaying plant material in the soil. The photographs show how a woodlouse can curl up into a ball.

This behaviour is an example of a reflex response.

Give a reason why this reflex response benefits the woodlouse.

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Edexcel IGCSE Biology 2.80 Responses to Environmental Change Questions question 1