Signs of life
| November 16, 2020 | Education
An organism is any living object: an animal, a plant, even a bacterium.
Despite the wide variety of living organisms, they have signs that are characteristic only of living organisms – signs of life .
Signs of life are breathing , nutrition, excretion, growth and development, movement, irritability, and reproduction.
Breathing is the absorption of oxygen and the release of carbon dioxide.
Animal respiration is evidenced by water vapor, which becomes visible in cold weather. Plant respiration can also be observed in the aquarium: the exhaled gas forms bubbles on the plant leaves
Nutrition – The absorption of nutrients and water.
Plants produce nutrients from carbon dioxide and water using solar energy. Animals absorb nutrients produced by other organisms, receiving the necessary energy from them.
Excretion of substances – removal from the body of excess water, unused nutrients, carbon dioxide.
Animals have a special excretory system. Water evaporated by plants can be collected in a bag.
Growth – an increase in size and mass. Development is the acquisition of new qualities.
Movement is a change in the position of the body in space.
Animals have special organs of movement. Plants lean towards the light.
Irritability is the body’s ability to respond to environmental changes.
To perceive irritation, many animals have special organs, for example, eyes, ears. When an insect touches a sundew leaf, the plant curls up and grabs it
Reproduction – reproduction of their own kind.
Baby crocodile hatch from egg. Plants reproduce by seed
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.