Light - Lighter it is the faster the transpiration rate as stomata open more in light so CO2 enters for photosynthesis but in exchange water is lost by transpirationTemperature - Higher temperature means faster transpiration rate as water molecules evaporate faster due to higher concentration gradient between leaf and outside leafHumidity - lower the humidity the faster the transpiration rate, as air around plant is dry so concentration gradient is increased and thus transpiration increasesWind - Windier it is the higher the transpiration rate, as air blows away water molecules around stomata

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