$$\(2 \quad \mathrm{P} 1\)$$ is a slide of a stained transverse section through a plant leaf. Fig. 2.2 is the same photomicrograph of a transverse section of a leaf as is shown in Fig. 2.1. (i) In Fig. 2.2, the lines L1, L2, L3 and L4 are drawn across the lengths of four air spaces. Measure the lengths in the photomicrograph of these four air spaces, along the lines L1, L2, L3 and L4. length of $$\(\mathbf{L 1}=\)$$ ........................................................... length of $$\(\mathbf{L 2}=\)$$ ........................................................... length of $$\(\mathbf{L 3}=\)$$ ........................................................... length of L4 $$\(=\)$$ ........................................................... Calculate the mean length in the photomicrograph of the four air spaces. Show your working. mean length $$\(=\)$$ ........................................................... (ii) Calculate the mean actual length of these four air spaces in micrometres ( $$\(\mu \mathrm{m}\)$$ ), using your answer to (c)(i) and the magnification in Fig. 2.2. Show your working. Give your answer to an appropriate number of significant figures. mean actual length $$\(=\)$$ ..................................................... $$\(\mu \mathrm{m}\)$$

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