NUTRITION, RESPIRATION, AND OTHER CHARACTERISTICS OF LIVING ORGANISM.
Every living organism you see today exhibit eight characteristics which distinguishes them from non-living things. These are;
MOVEMENT: This is described as the ability of an object or a thing to move from one place to another. In order words, a thing is said to move when it covers a distance at a particular time. Living organisms have the ability to move from one places to another.
The necessity for this characteristics comes from the fact that In order to survive, living organisms need to search for food. If there wasn’t the ability to move, man will eventually die, ants will end up not able to store their food, and so on and so forth. Movement is one of the most important characteristics of living things.
RESPIRATION: Taking man for example, the ability to continuously exist is bore from the exchange of gases within the body (containing CO2) with those from the outside environment (containing O2). Respiration therefore the exchange of gases between organisms and the environment. Living things take in Oxygen while they also breathe out Carbondioxide. It is therefore a vital characteristics of living things.
NUTRITION: This is the ability of living things to feed the body with food. Food is essential for body growth and development therefore it is expedient for living things to have a system in place to ensure that they feed from time to time.
IRRITABILITY: A test to know if someone is alive or not can be to punch him or her with a sharp ibject. Once animal doesn’t move after you scare it with a sharp knife, it shows that it is dead. So irritability is the ability of living organisms to respond to stimulus.
Stimulus can be in form of force, pressure, chemical, mechanical, electrical, etc.
GROWTH: It is expedient that growth occurs. It is only non living things that do not grow. Growth is the ability of a thing to experience an increase in size, volume or shape. Growth does not only reveal in the height of a boy or the fatness of a girl; whereas, it is also revealed in the mental and physiological aspect of living things.
EXCRETION: This is the removal of waste metabolic products from the body. It is an essential characteristics of a living thing. Ones a man cannot defecate on his own, problem has arisen. The purpose of excretion is to remove waste products of metabolism.
REPRODUCTION: Many of us know what reproduction entails. It is the ability to reproduce; to multiply; to procreate. If there were no reproduction, extinction would have occurred long time ago. Therefore It remains a vital characteristics of living things.
DEATH: To every beginning, there is surely an end. The existence of each living things is bound with time and would elapse one day.