Biological washing powders contain enzymes that break down food stains. Complete Table $$\(2.1\)$$ by naming the enzymes that break down three substances in food stains and by stating the product or products. Some students compared how effective biological and non-biological washing powders are at removing stains at temperatures between $$\(10^{\circ} \mathrm{C}\)$$ and $$\(60^{\circ} \mathrm{C}\)$$. - Pieces of stained cloth were washed using two different washing powders. - The degree of stain removal was measured by using a light meter to record the percentage of light reflected from the cloth. - A light meter gave a value of $$\(100 \%\)$$ when the cloth was completely clean. - Any stain left on the cloth reduced the percentage of light reflected. The results of the students' investigation are shown in Fig. 2.1.

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