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13 Cards in this Set
- Front
- Back
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What is an ecosystem? |
All the organisms and non-living factors in a certain area. |
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What are abiotic factors? |
Non-living features of an ecosystem. |
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What are biotic factors? |
Living organisms in an ecosystem. |
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What are the biotic and abiotic factors in a rock pool? |
Biotic factors = seaweed can be a food source. Intense competition for food like seaweed can limit populations. Abiotic factors = at low tide there are extreme conditions (high salinity) and only some organisms can tolerate this. |
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What are the biotic and abiotic factors in a playing field? |
Biotic factors = producers include grass and flowers which will attract a large number of organisms which use them as a food source. Abiotic factors = rainfall and sunlight affect the growth of the producers, may affect number of consumers. |
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What are the biotic and abiotic factors of a large tree? |
Biotic factors = insects can eat the leaves however if they eat all the leaves the tree will die. Abiotic factors = drought conditions can negatively impact the growth of the tree. |
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How do you find net productivity from gross productivity and respiratory loss? |
Gross productivity - respiratory loss |
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How do you find the percentage efficiency of energy transfer? |
(net productivity/net productivity of previous trophic level) x 100 |
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How do herbicides manipulate the transfer of biomass through ecosystems? |
They reduce competition meaning more energy can be used to grow, increasing productivity. |
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What are the 6 human activities which can manipulate the transfer of biomass through an ecosystem? |
Herbicides, insecticides, fungicides, introducing natural predators, fertilisers, livestock rearing |
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What effect do all 6 human activities have? |
More energy can be used to grow, increasing productivity. |
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What are the 4 steps of the nitrogen cycle? |
Nitrogen fixation, ammonification, nitrification and denitrification. |
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What happens in nitrogen fixation? |
Nitrogen gas in the atmosphere is turned into ammonia by bacteria. Rhizobium = |
