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Definition
A group of organisms of the same species who live in the same area at the same time |
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Definition
A group of populations living and interacting with each other in an area |
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Definition
A community and its abiotic environment |
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The study of relationships between living organisms and between organisms and their environment |
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Term
What is the difference between autotroph and heterotroph (2 Points)
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Definition
An autotroph synthesizes its organic molecules from simple inorganic substances whereas a heterotroph obtains organic molecules from other organisms. |
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What is the initial energy source for almost all communities (1 Point)
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Construct a food web and label the trophic levels (3 Points) |
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What is a trophic level (2 Points)
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Definition
| Each of several hierarchical levels in an ecosystem, comprising organisms that share the same function in the food chain and the same nutritional relationship to the primary sources of energy |
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What is the difference between a consumer organism, a detritivore organism and a saprotroph organism (3 Points)
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Definition
- Consumers ingest other organic matter that is living or recently killed
- Detritivores ingest non living organic matter
- Saprotrophs live in non living organic matter, secreting digestive enzymes into it and absorbing the products of digestion
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What is the energy loss in a food web |
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Definition
Energy loss happens between trophic levels where material not consumed or material not assimilated and heat loss through respiration occurs. |
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What are 3 forms in which energy is lost between trophic levels (3 Points) |
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Definition
- heat through cell respiration
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What are characteristics of Saprotrophic Bacteria and Fungi (decomposers) (5 Points)
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Definition
* trapped within the bodies of dead organisms and feces are nutrients such as phosphorus, nitrogen, potassium etc.
* saprotrophs feed by secreting digestive enzymes onto dead bodies and fecal matter
* they gradually break down dead organisms and release minerals from bodies of dead organisms
* rainwater will leach these minerals into the soil making them available for use by plants
* they can then pass on up through the food chain |
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