What substances do plants release as a result of their vital activity?

Plants, as a result of their vital activity, like any other living organism, absorb and excrete various substances. For example, through the process of photosynthesis, which occurs during the daytime, plants release oxygen while absorbing carbon dioxide. At night, everything is exactly the opposite: oxygen is absorbed and carbon dioxide is released. In addition to carbon dioxide and oxygen, plants emit other, a wide variety of substances – alkaloids, phytoncides, essential oils, resins, nectar.