Biology- Indicator Species

Question 1

Living organisms can be used as….

Answer 1

indicators of environmental change.

Question 2

Air pollution (sulphur dioxide) can be indicated by counting….

Answer 2

the number of different lichen species and their abundances.

Question 3

Non-living indicators:

Answer 3

environmental changes can be measured using non-living indicators such as oxygen levels, rainfall and temperature.

Question 4

Advantages and Disadvantages:

Answer 4

cost of equipment, battery failure, human error, visit the site twice, interfered with by passers by, living indicators tell you about the viability of life, non-living indicators only tell you about one factor, living indicators are influenced by many other factors and their population size.

Question 5

Validity:

Answer 5

a measurement is valid if it is measuring what it is supposed to be measuring

Question 6

Repeatability:

Answer 6

The precision obtained when results are produced by one group, using the same equipment, in the same place on the same day

Question 7

Reproducibility:

Answer 7

The precision obtained when results are produced by different groups, in different places, using different equipment or different times.

Question 8

Precision:

Answer 8

The closeness of results to each other

Question 9

Accuracy:

Answer 9

The closeness of the measured value to the true value