Life on Earth - Distribution of Organisms T4

Question 1

Biotic factors

Answer 1

Factors associated with living organisms. For example predation, grazing and disease.

Question 2

Abiotic factors

Answer 2

Non living factors for example soil pH, temperature and soil moisture.

Question 3

Indicator species

Answer 3

An indicator species is a species that by its presence or absence shows the environmental quality/levels of pollution of an area.
Examples include lichens and freshwater invertebrates. .

Question 4

Pitfall Traps

Answer 4

Measure the abundance of organisms in an area.

Minimise errors- make sure top of trap is level with soil/ repeat.

Question 5

Quadrat

Answer 5

Measure the abundance of plants in an area.

Minimise errors - throw quadrants randomly/ repeat.

Question 6

pH Meter

Answer 6

Measures pH of the soil.

Wipe probe down after using to avoid cross contamination from previous tests.

Question 7

Light Meter

Answer 7

Measures light levels in an area.

Ensure that you are not shading the probe.

Question 8

Moisture Meter

Answer 8

Measures the moisture levels in the soil.

Wipe probe down to avoid cross contamination between previous tests.

Question 9

Soil Thermometer

Answer 9

Measures temperature of soil.

Repeat.