The Characteristics of Life
Life
the prossession of all the characteristics such as organisation nutirition excretion response and reproduction
1. Organisation
living things are composed of cells, tissues, organs and organ systems.
cell- cheek cell
tissue- lining of cheek
organ-stomach
organ system- digestive system
organism- individual human
population- all the people living in one area
2. Nutrition
is the way organisms obtain and use food.
The sun is the basic source of energy for all nutrition.
plants use sunlight directly to make food.- Photosynthesis.
sun (energy)===> Plants (energy) ===>Animals
3. Excretion
is the removal of waste products of metabolism frorm the body.
in humans exretory structures are the skin, lungs and urinary system (kidneys and bladder).products exreted are carbon dioxide,salts and surplus water.
plants excrete waste gases through openings called stomata.
4. Response
the way in which all living things react to changes (stimuli) in their environment or surroundings.
ANIMALS- respond to stimuli such as light ,temperature, pressure, and sound
PLANTS- respond to water , light, gravity, touch and chemicals.
5. Reproduction
is the production of new individuals.
Sexual Reproduction- the union of sex cells (gametes) formed by two parents. male and female
Asexual Reprodution- involves simple organisms splitting into 2 or more identical offsprings.
Main topic
Metabolism
Anabolic
anabolism
Subtopic
Catabolic
catabolism
is the sum of all the chemical reactions in an organism
