Sampling-life On Earth Flashcards Preview

Biology n5 > Sampling-life On Earth > Flashcards

Flashcards in Sampling-life On Earth Deck (15):
0

What does sampling allow you to do?

Sampling allows a representative picture of the types and numbers of organisms present to be determined

1

Give 2 reasons why it's impossible to sample a whole ecosystem

•it would be too time consuming
•too many organisms to count without making an error

2

Name 4 sampling techniques

•Quadrat
•pitfall trap
•tree beating
•tullgren funnel

3

Name 2 limits to a quadrat and how you would solve these problems

•organisms wrongly identified-have a key to identify unknown organisms
•counted incorrectly/inconsistently-have a counting rule (half out the quadrat is either counted or not counted)

4

Give 2 limits of a pitfall trap and how you would solve these problems

•flying organisms can fly out-make a lid
•animals may drown-needle holes to drain water

5

Name a limit of tree beating and how you would solve it

Animals may not fall onto the sheet or tray- have a big sheet/tray and move it to where you are beating

6

Name 2 limits to a tullgren funnel

•animals may die in soil before reaching collecting jar-place only a thin layer of soil
•animals may be too large to pass through mesh funnel-mesh should have holes of different sizes

7

What do you measure light intensity with?
Name a limit and how you would solve the problem

A light meter
Shaded by user- stand to the side at arms length

8

What do you measure temperature with?
Name a limit and how you would solve the problem

A thermometer
Bulb held in hand- don't hold the bulb!!

9

What do you measure pH with?
Name a limit and how you would solve the problem

A pH meter
It could be contaminated from last sample- wipe probe between sampling

10

What do you measure soil moisture with?
Name a limit and how you would solve the problem

A moisture meter
It could be contaminated from last sample- wipe probe between sampling

11

What do keys allow?

They allow easy identification of unknown organisms

12

What's a paired statement key?

There is a numbered list of statements, Choose the best fitting two statements and follow onto the next statement it leads onto

13

What is a branched key?

It is structured in branches instead of statements, find the matching branch and work your way down until you have identified the organism

14

What is a transect?

A transect is a sample strip of land used to monitor plant distribution, animal populations etc. within a given area