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Unit 1: Study Stack
Characteristics of Life and Scientific Method
| Term | Definition |
|---|---|
| 6 characteristics of life | Made of cells, responds, grow & develop, reproduce, made of chemicals, uses energy |
| 4 basic needs of all living things | water, food, living space, stable internal conditions (homeostasis) |
| Science | a way of learning about the natural world |
| scientific inquiry | the diverse way in which sceintists study the natural world |
| observation | using one or more of your senses to gather information/data. Can use scientific tools as well to enhance the observation. |
| inference | an interpretation of an observation that is based on evidence or prior knowledge |
| hypothesis | a possible explanation for a set of observations or a scientific problem |
| problem | a question that is asked about observations one might make |
| variables | factors that can change in an experiment |
| independent (manipulated) variable | the variable that "I" the scientist change to test a hypothesis |
| dependent (responding) variable | the factor that changes because of the independent variable; the DATA collected or what is measured |
| controlled experiment | all variables except ONE remain the same |
| control | the set up in an experiment to which you compare results to; does not contain the independent variable |
| constant | all the variables that remain the same |
| unicellular | single-celled organisms |
| multicellular | organisms composed of many cells |
| cell | the basic unit of structure and function in an organism |
| organisms | a living thing |
| development | process of change that occurs during an organism's lifeto produce a more complex organism |
| stimulus | a change in an organism's environment that causes the organism to react |
| respond | an action or change in behavior |
| spontaneous generation | the mistaken idea that living things could arise from non-living things |
| Francesco Redi | Disproved spontaneous generation by placing rotting meat in an open container and a container with cloth over the top. Maggots only formed on the open container. Because no flies could lay eggs on the covered container, there were no maggots there. |
| Louis Pasteur | Disproved spontaneous generationby bioling brith in a curved neck flask killing all bacteria. The necks let in oxygen but kept out bacteria. In another flask he cut the top off the flask leaving it exposed to air. Bacteria only grew in the flask opened. |
| autotroph | makes its own food using photosynthesis |
| heterotroph | cannot make their own food |
| homeostasis | maintainance of stable internal conditions such as temperature adn glucose levels. |
| quantitative data | date using numbers and scientific tools |
| qualitative data | data using desciptions |
| data | the results of an experiment |
Created by:
jbuckley
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