🟢 2 Characteristics Of Life Flashcards
Define an organism
A living thing
Define metabolism
Sum of all chemical reactions in an organism
What is continuity of life
This means that living things arise from other living things of the same type
What are metabolic reactions controlled by
Chemicals called enzymes
Define life
Possession of ALL of these characteristics
-Organised
-Needs Nutrition
-Needs Excretion
-Capable of Responding
-Capable of Reproducing
ONERR
What does characteristic 1.Organisation mean
Living things are composed of cells tissues organs and organ systems
E.g Stomach cell, Digestive system
What does characteristic 2.Nutrition Mean
Nutrition is the way organisms obtain and use food
What does characteristic 3.Excretion mean
Removal of waste products of metabolism from the body
Plants-Excrete gases through stomata
Animals-Transfer waste from cells into blood and then to excretory structures such as kidneys bladder skin lungs
What does characteristic 4.Response mean
Way in which living things react to changes in their environment.
Also called behaviour
What does characteristic 5.Reproduction mean?
All life devolops off living things
Organisms must b able produce offspring of their own type by either
Sexual or Asexual reproduction
Define sexual reproduction
Involves the union of sex cells
Define Asexual reproduction
Does not involve the union of cells
