Distribution of Organisms 0.0 / 5 ? BiologyorganismsGCSEAQA Created by: asho glenoCreated on: 13-04-15 15:59 Environmental factors determine where... an organism lives 1 of 12 These include: Temperature, amount of water, availability of CO2 and Oxygen... availability of nutrients and amount of light 2 of 12 You can measure how common an organism is in two sample areas or... study the distribution changes across an area 3 of 12 By using a quadrat, you can do the first method and then find the... mean by doing the total number of organisms / number of quadrats 4 of 12 If you are asked to find the population size, get the answer by doing the previous equation, then... multiply it by the total area 5 of 12 Usin quadrats along a line is doing the same method before but... only counting the species in the quadrat on the line 6 of 12 1. Reliability - Quadrats are good tools for finding out if organisms are distributed but... you have to make sure the results are reliable (repeatable and reproducible) 7 of 12 You can do this by taking a larger sample size, as bigger samples are... more represntative of the whole population 8 of 12 Or use random samples, but note that this won't make the experiment... reproducible 9 of 12 2. Validity - To answer the original question, you need to... control all the variables 10 of 12 You need to answer whether a difference in distribution is due to... an environmental factor 11 of 12 If you don't control all the variables, you won't know if... there is a pattern between the two and it won't give you valid data 12 of 12
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