Edexcel IGCSE Biology 2.80 Responses to Environmental Change
Practise investigating and interpreting behavioural or plant responses to light, moisture, smell, repeated stimuli and water stress.
- Syllabus
- First assessment 2019
- Course
- Biology 4BI1
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
2.80 Responses to environmental change question 1
The diagram shows a food web from a woodland ecosystem.
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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