However, plants are unique in that they have the ability to use energy from sunlight along with other chemical elements for growth. This process of photosynthesis provides the world's supply of food and energy. Plants require certain inorganic elements for growth and play an essential role in the circulation of these nutrients within the biosphere. Reproduction in flowering plants takes place sexually, resulting in the production of a seed.
Reproduction can also occur via asexual propagation.
Plants, like animals and many microbes, respire and utilize energy to grow and reproduce. Cell walls provide structural support for the plant and also provide fibers and building materials for humans, insects, birds and many other organisms. Plants exhibit diversity in size and shape ranging from single cells to gigantic trees. Plants are a primary source of fiber, medicines and countless other important products in everyday use. Plants, like animals, are subject to injury and death due to infectious diseases caused by microorganisms.