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Phototaxis can be advantageous for phototrophic bacteria as they can orient themselves most efficiently to receive light for photosynthesis.Phototaxis is called positive if the movement is in the direction of increasing light intensity and negative if the direction is opposite.
Scotland occupies the cooler northern section of Great Britain, so temperatures are generally lower than in the rest of the British Isles, with the coldest ever UK temperature of −27.2 °C (−17.0 °F) recorded at Braemar in the Grampian Mountains, on 10 January 1982 and also at Altnaharra, Highland, on 30 December 1995.