Which of the following statements is false?
A) The ground tissue system of a leaf is called the mesophyll.
B) Each vein in a leaf is composed of either xylem or phloem, but not both.
C) The veins in a leaf are continuous with the veins of a stem.
D) The pith of a stem is often important in food storage.
E) Tissues that are neither dermal nor vascular are known as the ground tissue system.