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Charc. Of life
Characteristics of life
Question | Answer |
---|---|
what is biology | the study of living things |
what is an organism | a living thing. Small organisms=micro-organisms |
what must an organism have to be living? | the 5 characteristics of life |
the 5 characteristics of life | organisation/nutrition/excretion/response/reproduction |
organisation | means that all organisms consist of a structure that improves efficiency. e.g. cell->tissue->organ system |
definition of cell | smallest unit of a living thing that has all 5 characteristics of life e.g. muscle cell |
definition of tissue | a group of similar cells with the same function e.g. muscle tissue |
definition of organ | a group of different tissues with a specialised function e.g. the heart |
definition of organ system | is a group of organs working together to carry out a function e.g. Circulatory system |
nutrition | the ways an organism obtains and uses its food |
2 types of nutrition | autotrophic and heterotropic |
autotrophic nutrition | organisms that make their own food |
heterotrophic nutrition | organisms |
Excretion | the removal of waste products of metabolism from the body |
metabolism | is the sum of all the chemical reactions in the cell |
Response | the ability to detect change in the surroundings and then to respond adequately |
Reproduction | making more individuals of the same species (fusion of egg and sperm) |