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8th grade Review2010
| Question | Answer |
|---|---|
| individual | an single organism |
| population | all of the same species of an organism living a certain area, like all the deer |
| community | all of the different species of organisms living in a certain area |
| ecosystem | all of the organisms and non-living objects in a certain area |
| biotic | living |
| abiotic | non-living |
| producer | an organism that uses the sun to make its own food, it is at the bottom of an energy pyramid |
| primary consumer | an organism that eats plants, a herbivore |
| secondary consumer | an organism that eats other animals, a carnivore |
| decomposer | an organism, like bacteria, that eats and breaks down dead organisms |
| photosynthesis | the process of a plant making its own food; it take sin carbon dioxide and releases oxygen |
| homozygous | when the genes are both dominant or recessive, like TT or tt |
| heterozygous | when the genes are a mix of dominant or recessive, like Tt |
| phehotype | the external characteristics of an organism that are produced by a combination of genes, like blue eyes or curly hair |
| genotype | the genes that make up a characteristics, like Tt or tt |
| food web | a diagram that shows the feeding relationships between all the organisms in an area |
| energy pyramid | a diagram that shows how energy transfers between different organisms |
| density formula | D= M/V |
| density | the amount of matter or number of particles in an object |
| kinetic energy | energy of motion |
| potential energy | stored energy |
| mass market | many copies of the same item produced for the general population |
| niche market | a product made for a specific audience |
| physical change | a change in form or appearance of an object but not its composition, such as ice melting |
| chemical change | a change in an substance caused by a reaction; it creates a new substance |
| reactants | the molecules/atoms that are mixed in a chemical reaction |
| product | what is produced by a chemical reaction |
| compound | atoms that are bonded together and can't be split |
| substance | matter that has the same chemical composition throughout |
| mixture | a combination of elements and compounds that has not formed a new substance; can be separated out |
| melting | a change in the state of matter of an object, as from ice to water |
| newton's first law of motion | an object at rest will stay at rest AND an object in motion will stay in motion UNLESS an outside force acts on it |
| newton's third law of motion | for every action, there is an equal an opposite reaction |
| newton's second law of motion | the greater the mass of an object, the greater the force needed to accelerate that object |
| law of conservation of mass | mass is neither created nor destroyed; we can demonstrate this with a balanced equation |
| friction | a forces that acts to slow down the movement of an object |
| gravity | the force that pulls all objects towards the center of a planet |
Created by:
tbasci
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