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Laboratory 4

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Pre Laboratory 4
1. What are the three levels of ecological organization?
Answer : When referring to the level of ecological organization the three mains are represented by
population, communities, ecosystems. New data classify them in even more level, from the smallest to
biggest:
Individual: only one
Population: a group of individuals of the same species that live in the same zone
Community: different populations that live together in the same zone
Ecosystem: all the communities that live in a zone (it also includes the non-living components)
Biome: group of ecosystems that have the same dominant communities and also the same climate
Biosphere: the highest level of ecological organization
2. Describe the differences between an autotroph and a heterotroph . Provide an example of each
one.
Answer :
Autotrophs are best described as that organism that can produce their own food based on different
processes like chemosynthesis or photosynthesis.
Heterotrophs are not capable of synthesizing their own food and because of that they need to rely on
the other organism ( most of the time heterotrophs relay of autotrophs)
Autotrophs examples: plants ( oak tree , dandelions ) , bacteria ( cyanobacteria),algae
Heterotrophs examples: herbivores ( locusts), carnivores (sharks), omnivores (human )
3. What is a food web ?How does a food web represent trophic levels?
Answer: The food web is also known as food cycle and it represents an interconnection of food chains.
More exactly it refers what eats what or who eats who at an ecological community level. A trophic level
refers to what position does an organism occupy in the food chain. There are 4 trophic levels
Level 1: Producer it creates its own food the case of plants
Level 2: Primary Consumers they consume producers for example some insects

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Pre Laboratory 4 1. What are the three levels of ecological organization? Answer : When referring to the level of ecological organization the three mains are represented by population, communities, ecosystems. New data classify them in even more level, from the smallest to biggest: Individual: only one Population: a group of individuals of the same species that live in the same zone Community: different populations that live together in the same zone Ecosystem: all the communities that live in a zone (it also includes the non-living components) Biome: group of ecosystems that have the same dominant communities and also the same climate Biosphere: the highest level of ecological organization 2. Describe the differences between an autotroph and a heterotroph . Provide an example of each one. Answer : Autotrophs are best described as that organism that can produce their own food based on different processes like chemosynthesis or photosynthesis. Heterotrophs are not capable of synthesizing their own food and because of that they need to rely on the other organism ( most of the time heterotrophs relay of autotrophs) Autotrophs examples: plants ( oak tree , dandelions ) , bacteria ( cy ...
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