That is, carbon dioxide combines with water to yield glucose and oxygen. The vascular tissues that conduct water and nutrients from the roots to the rest of the plant are called xylem tubes.
Many herbaceous plants survive frost by storing food in underground stems, roots, or leaves.
They also used animals for food. At some point, humans discovered that new plants could be grown from seeds. So, by storing seeds through the winter new plants were available the next summer. This nectar attracts insects that carry pollen from stamen to pistil. The seed contains stored food for the growth of the new plant.