How dose a tree turn chemical energy into thermal energy?

The rays of the sun will go directly to the trees, then trees take up light that absorbs light energy which converting light to chemical potential energy kept in chemical bonds. And when the trees cut into woods and burnt it, it will convert to thermal energy.

The tree absorbs light energy from sunlight, converting the light energy into chemical potential energy stored in chemical bonds ... When the apple hits the ground, kinetic energy is transformed into heat energy. When you eat the apple, your body converts its chemical energy into the movement of your muscles.