Edexcel IGCSE Biology 2.80 Responses to Environmental Change Questions

Practise investigating and interpreting behavioural or plant responses to light, moisture, smell, repeated stimuli and water stress.

Exam points

design a fair response investigation with a changed stimulus and controlled variables
describe response trends from repeated-stimulus data before explaining survival value
compare linked graphs, such as ABA concentration and water loss, using quantitative evidence

[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