Exam (elaborations)
B7 - Ecology
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B7 – EcologyEcosystem####Interaction of a community of living and non-living parts of their environment
Interdependence####Species’ reliance on each other
Abiotic factors####Non-living factors that affect a community
3 examples of abiotic factors####Light, temperature, soil pH
Biotic factors####Living factors that
3 examples of biotic factors####Availability of food, predators, pathogens
Adaptation####Features that enable a species to survive
Producer####Starts off the food chain
Quadrat####Square frame used to estimate a population
Transect####A straight line in which samples are taken at regular intervals
Carbon cycle####The movement of carbon atoms in and out of the atmosphere
Water cycle####Movement of water molecules between atmosphere, oceans and land
Water cycle aka####Hydrologic cycle
Biodiversity####Variety of organisms within an ecosystem
Decomposers####Organisms that break down dead plant and animal matter
How do decomposers break down matter?####Secrete enzymes
Pyramid of biomass####A representation of the amount of biomass at each tropic level
Food security####Having enough food to feed a population
Decay####breakdown of dead matter
What 4 factors affect the rate decay?####oxygen, temperature, water, number of decay organisms
What is the Required Practical for decay?####investigation of how temperature affects decay -
measuring decrease of pH of milk when lipase is broken down
How is the change of pH measured in the RP on decay?####indicator dye - phenolphthalein
What is the independent variable for RP on decay?####temperature of test tube
What is the dependent variable for the RP on decay?####rate of decay
trophic levels####the position of an organism in a food chain or web or pyramid of biomass
producer####an organism that produces its ow energy
how do producers produce their own energy?####photosynthesis, chemosynthesis
What is the formula for biomass efficiency?####Efficiency = Biomass transferred to the next level /
Biomass available at the previous level x100
structural adaptation####a change in an organism's structure to help it survive
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