ch 2 The Characteristics of Life Flashcards
what is an organism?
it is a living thing
what is metabolism?
the sum of all chemical reactions in an organism.
what is the continuity of life?
living things arise from other living things of the same type.
what is meant by the term ‘life’?
the possession of all 5 characteristics: organised, requiring nutrition,excretion, capable of responding and reproducing.
organisation
living things are composed of cells, tissues, organs and organ systems.
nutrition
the way organisms obtain and use food.
excretion *
the removal of metabolic waste from the body.
response
the way in which all living things react to changes in their environment.
reproduction
the production of new individuals
2 types sexual and asexual
sexual reproduction
involves the union of sex cells
asexual reproduction
does not involve the union of sex cells.
unicellular organisms
single celled
multicellular organisms
contain many cells
