Three Umami receptors - T1R1, T1R2 and T1R3 in the gustatory system activates the Umami and sweetness tastes. These receptors get binds to the molecules of food to produce taste. The Umami is the fifth taste apart from the tastes other than bitter, salts, sour and sweetness and its presence is linked to the amino acid i.e glutamate. It is not exact taste but is considered as taste due to its meatiness sensation and due to this reason a cat usually enjoys a non-veg food in the similar manner as the other kind of foods.
The mass of a tree is primarily carbon. The carbon comes from carbon dioxide used during photosynthesis. During photosynthesis, plants convert the sun's energy into chemical energy which is captured within the bonds of carbon molecules built from atmospheric carbon dioxide and water.