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20 Cards in this Set
- Front
- Back
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What is the first level of organization of living things?
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the cell
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Each cell has a special shape so that it can carry out a particular activity,this is called ..
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cell specialization
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What is a tissue and what level of organization is this?
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A tissue is a group of struturely similar cells performing a similar activity.This the second level of organization.
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Two or more tissues working together to carry out a common function is called ...what level of organization is this and give 2 examples
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an organ,third level,animals-lungs,kidney,plants-stems,leaves.
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What is a system ,what is the level of organization ?Give 2 examples.
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A system is 2 or more different organs working together to carry out a common function
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What is the responsibility of the digestive system?
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It is responsible for the breaking down of complex,insoluble foods to simple soluble forms.
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Name three organs in the digestive system.
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oesophagus,intestines,liver
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Name 3 organs in the respiratory system.
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nostrils,trachea,lungs
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What is diffusion?
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Diffusion is the net movement of particles from an area of high concentration to an area of low concentration along a diffusion gradient.
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What is a diffusion gradient?
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Diffusion gradient is the difference in concentration between 2 regions before diffusion occurs.
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Where does diffusion take place?
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Diffusion can take place in gases and liquids.
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When does a diffusion gradient occur?
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When there is a difference in the number of molecules or concentration of molecules between two regions
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_________ is very important in the movement of molecules and ions in and out of the cell.
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diffusion
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Explain an example of diffusion in humans
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Diffusion occurs in lungs.Carbon dioxide diffuses from the blood where it is at higher concentration into the lungs where it's concentration is lower.
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Give an example of diffusion in amoeba.
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In amoeba waste such as ammonia are at a higher concentration in the cell than in it's surrounding environment-water.Hence ammonia diffuses from the cell into the surrounding medium.
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Why is diffusion also important in digestion?
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Some of the products in digestion are aborbed from ileum (small intestines)of mammals by diffusion.
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How does diffusion help plants?
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Plants need carbon dioxide for photosynthesis.This diffuses from the air into the leaves through the stomata.This is because carbon dioxide is in a higher concentration ouside the leaves therefore it moves into the leaves where it is in a lowerconcentration
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The net movement of molecules (usually water) from an area of high concentration to an area of low concentration across a selectively permeable membrane is called..
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Osmosis
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Selectively permeable means..
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only water and some substances can pass through the membrane but other substances cannot.
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There are three types of processes that facilitate movement in different organisms,they are..
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diffision,osmosis and active transport.
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