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B7 - Ecology

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  • July 16, 2023
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  • 2022/2023
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B7 – Ecology

Ecosystem####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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