Sampling Techniques

What does biodiversity mean?

• The number of organisms within a species

• The variety of living things within an ecosystem

• The number of steps within a food chain

• How biology is divided

The technique which ecologists use to quantify the biodiversity of area is called?

• Sampling

• Documentation

• Recording

• Observation

The apparatus used to quantify plants is called

• Camera

• Pitfall trap

• Quadrat

• Notepad

Why is it that the higher the biodiversity the healthier the ecosystem?

• Healthy ecosystem has more insects that feed everything else

• Healthy ecosystem tends to make bigger animals

• High biodiversity of an ecosystem allows it to more resilient to changes

• High diversity means the area is looked after people

Why are quadrats placed randomly?

• To ensure repeatability

• To improve accuracy

• To avoid bias

• To ensure validity of results

• 8

• 80

• 800

• 8000

What method would you use to monitor the change in distribution of species due to changes in environmental conditions?

• Random quadrats

• Line transect

• Capture-recapture

There are three main sampling techniques that can be used in ecology. Which of the following is not one of them?

• Random

• Systematic

• Stratified

• Clustered

Which of the following statements describes stratified sampling?

• Stratified sampling is used when the population has known subsets.

• Stratified sampling is used when every item has the same chance of being selected.

• Stratified sampling is where samples are chosen in a regular way.

• All of the statements describe an aspect of stratified sampling.

Relative representation of a species in a particular ecosystem , best describes?

• abundance

• distribution

• individual count

• percentage cover