Science Labs Quiz: Sampling

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what are the steps you would use to make a sample of all of the dandelions in your yard?

1. divide yard into grid 2. randomly choose grids to sample 3. collect data and calculate average 4. multiply average by total boxes/grids

what are factors that caused an increase in the rabbit population?

Plentiful food, spring coming early, more rabbits moving into the area

what are the steps of random sampling?

add up the numbers, divide by the amount of numbers given, and multiply by the amount of squares in the grid

what is a census?

an official count or survey of every organism in a population

why is population sampling more effective when there is even dispersion instead of clumped dispersion?

because clumped dispersion can inflate or deflate the estimate

why do scientists need to estimate the size of a population?

because it is difficult to find the actual size of a population because organisms will move around and some may be missed

why can't scientists just go into the forest and count the amount of sunflower plants?

because there is room for error, and random sampling saves money, time and effort

why is the mark and recapture method used instead of counting all of the organisms in a population or instead of using the random sampling method with fish in a pond?

because unlike plants, organisms move around, so the other methods do not work

what are the options an organism has if they have a low or inadequate food supply?

die/go hungry, move out of the area, or eat a different species of animal (one that they might not ordinarily eat)

in the predator/prey lab, what two animals were used?

foxes (predator), rabbits (prey)

what happened to the rabbits when the pheasant population decreased?

foxes ate more rabbits, so the rabbit population decreased

what are factors that decreased the rabbit population?

harsh winter, inadequate food supply, disease, and more foxes eating rabbits

what will happen if a population keeps getting exponentially higher?

it will eventually get overpopulated then resources run out and some will die since they can't get what they need

what are factors that caused a decrease in the fox population

low food supply, hunters, disease among rabbits, foxes moving out of the area

factors that will cause an increase in the fox population

plentiful food, foxes moving into the area, large litters, eating pheasants as well as rabbits

why do biologists use sampling?

so that they can get the amount of species in an area

why do scientists use random sampling?

to estimate the size of a population without taking a census

why was a paper-slip method used to select the grid segments in the random sampling lab?

to keep it random and eliminate bias


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