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15 Cards in this Set
- Front
- Back
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habitat |
place where an organism lives |
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population |
is a group of organisms of the same species that live together in a habitat |
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community |
all the different populations of organisms living and interacting with one another in a habitat |
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ecosystem |
is a community of organisms interacting with one another and its abiotic environment |
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abiotic env |
climate and physical features of the environment |
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abiotic env examples |
light intensity temperature ph of soil and water salinity of soil and water water availability oxygen content |
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biotic env |
comprises of all the living organisms that an organism interacts with in its habitat |
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producers |
are organisms that can make their own food by photosynthesis they contain chlorophyll which traps and converts light energy into chemical energy |
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consumers |
are organisms which are unable to make their own food they obtain energy by feeding on other organisms |
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decomposers |
decomposers such as bacteria and fungi feed on decaying organic matter and return nutrients to the environment |
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food chain |
is a series of organisms through which energy is transferred in the form of food |
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food web |
consists of interlinked food chains |
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how is pyramid of biomass obtained |
1. anaesthesise 10 rabbits before killing them. dry the rabbits in a 100°C oven until a constant mass is obtained. 2. let the dry mass of 10 rabbits be A grams 3. repeat 1 and 2 for all the other trophic levels and construct a pyramid of biomass using the info obtained |
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carbon sink |
a carbon sink is an area that stores carbon compounds for an indefinite period. it stores more carbon than it releases. |
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examples of carbon sinks |
oceans: - largest carbon sinks - absorbs 1/3 of carbon dioxide released by human activities - used by phytoplankton and algae in photosynthesis - buried in seabed in form of fossil fuels
forests: - atmospheric carbon dioxide is absorbed by plants and used for photosynthesis - when trees that store large amounts of carbon compounds die, their remains get buried deep in the ground. this forms fossil fuels such as coal after millions of years |
