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19 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is Bioaccumulation?
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When a toxic substance moves through a food chain and is accumulated faster than it is eliminated.
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What is biomagnification?
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How the concentration of a toxic substance multiplies as it goes up in the food chain.
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What are 2 examples of toxic substances that could bioaccumulate and biomagnify if introduced into a food chain?
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DDT and PCBs
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How is PCB concentration measured?
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Parts per million (ppm)
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How is the energy taken in by a consumer used?
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It's divided unevenly into 3 places.
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What are some examples of tropic levels?
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Producer
Primary consumer Secondary consumer Tertiary consumer |
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What is the difference between a pyramid of energy, a pyramid of numbers and a pyramid of biomass?
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Pyramid of energy - shows the energy moving through the foodchain. (Only 10% passed on each tropic level)
Pyramid of numbers - shows the number of organisms at each tropic level. Pyramid of biomass - shows the total mass of living organisms at each tropic level. (Measured in grams dry weight per square meter) |
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What is the difference between a food chain and a food web?
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A food chain is a diagram showing a simple line of a producer and consumers.
A food web has many interlocking food chains within it to create a more complex ecosystem. |
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What were some specific negative effects of DDT
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The eggs shells of fish-eating birds were not strong.
It created a massive problem in the fishing industry. (The ministry of natural resources monitors the levels of toxins in sport fish in case they're hazardous to your health) |
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What type of pesticide is DDT?
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A broad-spectrum pesticide.
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Why was there a problem with DDT?
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It would not break down easily in the environment - it gets passed on through the food chain and is accumulated in the fatty tissues of organisms.
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Which trophic level is most affected by toxic substances such as DDT?
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The top carnivore.
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What type of pyramid is this?
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Pyramid of energy.
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What type of pyramid is this?
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Pyramid of energy.
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What type of pyramid is this?
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Pyramid of numbers.
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What type of pyramid is this?
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Pyramid of Biomass.
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What is the producer in this food chain?
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Grass.
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Is this a food chain or a food web?
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Food chain.
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Which type of ecosystem is most vulnerable to biomagnification of toxic substances?
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Arctic ecosystems.
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