Distinguish between primary growth and secondary growth in plants, indicating which meristems are responsible for each.

Primary growth refers to the increase in the length of a plant, occurring at the tips of roots and shoots. It is primarily brought about by the activity of apical meristems. Secondary growth refers to the increase in the girth or diameter of a plant, typically seen in woody plants. It is brought about by the activity of lateral meristems, specifically the vascular cambium and cork cambium.