In the process some of the mass of the hydrogen atoms is converted into energy in the form of light. The same process occurs in thermonuclear (fusion) bombs. In the Sun the process occurs in a controled manner. In a bomb it happens all at once in a big chain-reaction explosion.
Phloem. Definition. noun. A tissue in a vascular plant that functions primarily in transporting organic food materials (e.g. sucrose) from the photosynthetic organ (leaf) to all the parts of the plant.
Xylem tissue is the water-transport tissue carrying water and minerals from the roots up the plant. body, and phloem tissue is the food-transport tissue carrying phloem sap (food nutrients) from food sources. (leaves or food storage organs) to food sinks (growing non-photosynthetic structures or food storage organs).