Green power plant
Under the influence of sunlight, oxygen and glucose are produced in the green chloroplasts of the leaf cells from carbon dioxide, water, and nutrient salts. This process is called photosynthesis; it is a prerequisite for human and animal life on our earth. The oxygen is released into the air and the sugar is converted into components of the plant, for example into cellulose. To do this, the sap must be directed from the leaves to the tips of the roots. In the tree this happens in the phloem layer under the bark.