Topic 17 - Practical skills 3.0 / 5 based on 1 rating ? Environmental Science/StudiesPractical skillsASAQA Created by: ellagoddard99Created on: 09-04-16 18:51 DAFOR scale A qualitative scale that judges the abundance of organisms. 1 of 14 Dependent variable The factor where the results are measured. 2 of 14 Homogenous Evenly mixed. 3 of 14 Hypothesis The theory or explanation that is being investigated. 4 of 14 Independent variable The factor that is deliberately altered or measured to see if it affects the dependent variable. 5 of 14 Lincoln index A catch, mark, release, recapture method to estimate animal populations. 6 of 14 Null hypothesis The no-link theory against which the hypothesis is being tested. 7 of 14 Pitfall trap A method of sampling animal populations by collecting individuals that fall into the traps set into the ground. 8 of 14 Pooter A mouth-suction device used to pick up invertebrates in soil or leaf litter. 9 of 14 Quadrat An area, usually square or circular, in which samples are taken. 10 of 14 Secchi disc A circular disc divided into four black and white segments that is used to estimate water turbidity. 11 of 14 Surber sampler An aquatic invertebrate sampling frame ad net that provides more quantitative data than kick sampling. 12 of 14 Transect A line or belt of sampling sites across an area. 13 of 14 Tullgreen funnel A piece of equipment used to extract invertebrates from soil or leaf litter. 14 of 14
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