Ernst Munch used the pressure flow hypothesis to explain movement of substances in this tissue. This tissue is composed of companion cells, which aid 
Ernst Munch used the pressure flow hypothesis to explain movement of substances in this tissue. This tissue is composed of companion cells, which aid elongated cells with nuclei, the sieve-tube members. Movement in this tissue is bidirectional, but always goes from sugar sources to sugar sinks. It is formed on the outside of the vascular cambium, and transports food throughout a plant. For 10 points, name this tissue of vascular plants, which is contrasted with xylem.
Ernst Munch used the pressure flow hypothesis to explain movement of substances in this tissue.
{phloem}