A seed is a baby plant (embryo) enclosed in a protective outer covering known as the seed coat. Seeds are produced by the flowers of the plant. A seed begins to grow when it gets proper amount of water, air and warmth. This process is called sprouting or germination. The baby plant that comes out of the seed is called a sapling. Seeds vary in size, shape, pattern and colour. For example, begonia seeds are so small that they look like dust particles. On the other hand, coconuts are seeds which may weigh as much as 18 kg.