Woodlice are small animals that live in and under rotting wood. 20 woodlice were taken from a pile of logs in a forest and placed in the centre of a tray. The tray had black, dark grey and white squares painted on the bottom. The diagram shows where the woodlice were 30 minutes later. (a) Calculate the percentage of woodlice found on the black squares. (b) The woodlice move quickly on the light squares and slow down on the dark squares. All woodlice show this behaviour. State the term used to describe this type of behaviour.

GCSE Edexcel Biology Definitions: Woodlice are small animals that

Woodlice are small animals that live in and under rotting wood - Edexcel - GCSE Biology - Question 4 - 2013 - Paper 1

Question 4

Woodlice are small animals that live in and under rotting wood. 20 woodlice were taken from a pile of logs in a forest and placed in the centre of a tray. The tray h... show full transcript

Worked Solution & Example Answer:Woodlice are small animals that live in and under rotting wood - Edexcel - GCSE Biology - Question 4 - 2013 - Paper 1

Step 1

Calculate the percentage of woodlice found on the black squares.

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Answer

To calculate the percentage of woodlice found on the black squares, first identify the number of woodlice located on those squares

Count the number of woodlice on the black squares from the diagram. Suppose there are 5 woodlice on black squares.
The formula to calculate percentage is:

$ext{Percentage} = \left( \frac{\text{Number of woodlice on black squares}}{\text{Total number of woodlice}} \right) \times 100$
Substitute the values into the formula:

$ext{Percentage} = \left( \frac{5}{20} \right) \times 100 = 25\%$

Thus, the percentage of woodlice found on the black squares is 25%.

Step 2

State the term used to describe this type of behaviour.

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Answer

The term used to describe this type of behaviour is 'taxis'. Taxis refers to the movement of an organism toward or away from a stimulus, in this case, the response of woodlice to different light conditions.

Woodlice are small animals that live in and under rotting wood - Edexcel - GCSE Biology - Question 4 - 2013 - Paper 1

Worked Solution & Example Answer:Woodlice are small animals that live in and under rotting wood - Edexcel - GCSE Biology - Question 4 - 2013 - Paper 1

Calculate the percentage of woodlice found on the black squares.

State the term used to describe this type of behaviour.

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