B6.1.1 - Sampling Techniques 1 Flashcards
What is sampling?
Taking observations or measurements of a smaller area, which represents a larger area
How do you make estimates about a large sample using a smaller sample?
You scale the smaller sample size up to the larger sample size
What table should you construct after sampling?
Data collection table
What 3 columns would you use on a data collection table?
Organism name
Tally
Frequency
What are the differences between a tally and frequency?
A tally is used to count while the experiment is occurring, the frequency is the total of the tally that you would calculate after the experiment
Name examples of apparatus to help collect organisms.
Pooter
Sweep net
Describe how a pooter is used.
You suck on the mouthpiece to attract insects to the holding chamber. There is a filter to prevent the organisms from entering your mouth.
Describe how a sweep net is used.
You sweep a long net around the air to catch flying insects or those in long grass.
Name examples of techniques used to catch organisms.
Kick sampling
Tree beating
Pitfall traps
Describe kick sampling.
Kicking a mud bank to disturb mud and vegetation. Then, hold a net downstream as organisms are released into the flowing water
Describe tree beating.
Stretch a large white cloth under a tree. Then shake or beat the tree so organisms fall onto the cloth.
Describe pitfall traps.
Dig a hole which organisms can fall into. Make a roof for the hole so it does not flood with rain water
What do scientists use to identify living organisms?
Identification keys
What are the 2 main types of identification keys?
Branched (spider) key
Numbered (dichotomous) key
Describe a branched key.
Using yes or no questions to identify an organism.
