Which of the following essential substances is contained in vegetables?

Out of the given options, mineral salts are the essential substances contained in vegetables. Mineral salts, also known as micronutrients, are inorganic elements that are required by living organisms in small quantities to maintain good health. They play a critical role in various physiological and metabolic functions, including maintaining healthy bones, regulating the heartbeat, and producing energy. Vegetables are a good source of mineral salts as they are absorbed by the plants from the soil. Common mineral salts found in vegetables include calcium, iron, potassium, magnesium, and zinc.