Life on Earth - 3.2 Distribution of organisms

Question 1

give 5 examples of BIOtic factors ?

Answer 1

Disease
Competition for resources
Food availability
Grazing
Predation

Question 2

Give 4 examples of Abiotic factors ?

Answer 2

Light intensity
Moisture
PH
Temperature

Question 3

What is an indicator species ?

Answer 3

Indicator species are species that by their presence or absence indicate environmental quality/ levels of pollution

Question 4

How to measure Abiotic factors ?

Answer 4

light intensity - light meter/probe
soil moisture - moisture meter
pH - pH meter/probe
temperature - thermometer

Question 5

Abiotic factors errors ?

Answer 5

light meter - accidental covering of the probe, must be taken at the same time of day
soil moisture - must be placed at the same depth in the ground at each site and wiped clean between readings
pH probe - must be placed at the same depth and wiped clean between readings
temperature - thermometer must be held in the same position/depth at every sample point, time must be allowed for the reading to be taken

Question 6

Describe some human influences and describe the effects on biodiversity ?

Answer 6

air pollution
water pollution
habitat destruction by deforestation
desertification
overfishing