Unit 3 Topic 2 - Distribution Of Organisms
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What is a biotic factor?
living factors that can affect the size of a population
What is an abiotic factor?
non living factors that don’t involve living organisms and can affect the size of a population
Give an example of a biotic factor
• predators • competition • disease • food available • build up of organic waste
Give an example of an abiotic factor
• soil • PH • temp. • air humidity • rainfall • river flow/speed
A light meter…
Is used to measure light intensity
A thermometer…
Is used to measure temperature
A pH meter…
Is used for measuring the pH
A moisture meter…
Is used to measure how much water is in the soil
How should a quadrat be placed and why?
Randomly to increase reliability
What is a quadrat used for?
Sampling plants
What is a pitfall trap used for?
Sampling animals and insects
What is an indicator species?
organisms whos presence or lack there of indicate environmental quality and levels of pollution
Give an example if an indicator species
lichen: crusty lichen, shrubby lichen, hairy lichen invertebrates: mayfly nymph, dragonfly nymph, freshwater shrimp, hoglouse, worm,