Fig. 2.1 is a photomicrograph of part of an egg case from a species of stick insect, Acrophylla titan. The rate of respiration in a stick insect can be measured using a simple respirometer, as shown in Fig. 2.4. As the stick insect respires the drop of coloured liquid moves along the capillary tube. (i) Record the position in mm of the drop of coloured liquid in the capillary tube shown in Fig. 2.4 at the start and after 30 minutes. start ................................................ mm after 30 minutes ................................................ mm (ii) The capillary tube has an internal radius of 0.25 mm . Using the information in 2(b)(i), calculate the volume of oxygen used by the stick insect in 30 minutes. Use a value for $$\(\pi\)$$ of 3.14 . Space for working. ................................................... $$\(\mathrm{mm}^{3}\)$$ (iii) Using your answer to 2(b)(ii), calculate the rate of oxygen use by the stick insect. ............................ $$\(\mathrm{mm}^{3}\)$$ per minute

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