Variety of life and Classification Flashcards
How can you test the reliability of results?
By repeating an experiment - if repeats give the same or similar results it suggests they are reliable
Independent variable
The thing YOU change in the experiment (e.g. coke or diet coke)
Dependent variable
The thing that changes that you measure (blood sugar)
Control variable
The thing that you keep the same to make it a fair test
Mean
Add all the numbers together and divide by how many numbers there are
How do you increase the reliability of the mean
By repeating the experiment and calculating a new mean
What is more precise? mm or cm?
mm
What is more precise g or mg?
mg
What goes in the first column of a table?
Independent variable (the thing YOU change)
What goes in the second column of a table?
Dependent variable (the thing that changes in the experiment)
Where do the units go in a table?
In the headings
When do you use a bar graph?
When the independent variable is categoric e.g coke / diet coke
When do you use a line graph?
When the independent variable is continuous e.g. temperature or age
What does categoric mean
Different categories of data e.g. male/female
What is a discrete number?
Things you count and do in whole numbers e.g. number of individuals
What is a continuous variable?
Things you measure like mass, length, time (and don’t have to be whole numbers)
what do plant cells contain?
multi cellular organisms, e.g. cellulose cell wall, makes own food by photosynthesis (using chlorophyll in chloroplasts to harness light energy)
What do moulds play a role in?
Moulds play a role in decay; yeast used in beer / wine / bread making.