Excretion is known as the process of removing wastes no longer required by the body or a plant. Most wastes that are removed form a new born baby are Carbon Dioxide. This is very important because if the baby is born premature then it has a chance to develop RDS (Respiratory Distress Syndrome). Plants also have different ways of excreting the wastes.
Plants and basic animal's waste products are removed by diffusion. Plants, for example, excrete Oxygen using photosynthesis. In Humans waste products are removed by special excretory organs, mainly the kidneys, which excrete urea. Water and wastes are also excreted in the faeces and in humans through the sweat glands in the skin, carbon dioxide and water are removed via the lungs and the liver excretes bile. .
Plants.
Plant cells have large vacuoles that can be used for either storage or the storage of waste substances. Crystal formation in the vacuole can form if there is an accumulation of concentration.
Plants can also store the waste in organs that are destined to fall off or die off leaving the bulb underground.
Some plants will actively secrete waste compounds into the soil, occasionally using them as chemical weapons against other plants in competition.
Oxygen can be looked upon as a waste product of photosynthesis and Carbon dioxide a waste product of respiration; water is a waste product of both. You know how the gases are lost from leaves - don't you? Water will be lost through transpiration or just used for maintaining turgor in cells.
Some trees deposit strange chemicals in their branches and trunks, especially in old xylem which is probably no longer used for water transport. These are waste materials. Also gardeners find rotted autumn leaves a good source of minerals. .
Excretion in all living organisms.
Excretion removes metabolic waste from the body. In animals, nitrogenous waste is excreted from a specialized network of organs created to store and excrete wastes.
