The cells of beetroot contain a red pigment. A student investigated the effect of temperature onthe loss of red pigment from beetroot. He put discs cut from beetroot into tubes containing water.He maintained each tube at a different temperature. After 25 minutes, he measured thepercentage of light passing through the water in each tubeThe student put the same volume of water in each tube.Explain why it was important that he controlled this experimental variable [2 marks]

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