Home ยป The micronutrient which activates many enzymes and is necessary for photosynthesis is Nutrition MCQs The micronutrient which activates many enzymes and is necessary for photosynthesis is May 5, 2022 9 Views Q. The micronutrient which activates many enzymes and is necessary for photosynthesis is A. iron B. zinc monoxide C. nitric acid D. citric acid Answer: iron