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Biology, Chapter 2 Study Guide

Name________________________________

Date_____________________Grade_______
Across
Ultimate source of energy for food webs
Which level of a pyramid has the smallest number of organisms
Biotic factors that affect an organism include other species in the organisms ______________.
Biogeochemical cycle that that affects humans
Soil type to earthworm
Helps plants to grow faster
Adding _______ or phosphorus to an ecosystem would probably not affect organisms at high trophic levels
Biogeochemical cycle less dependent on biotic processes
A cougar's ________ in the community is to eat weakened or diseased animals
Group of like animals that live together
Increases soil nitrogen and phosphorus levels
Organisms with overlapping niches probably have this type of relationship
Relationship between humans, honeybees and birds
Down
Bacteria take nitrogenf rom the air and convert it to a form usable by plants
Nitrogen availability is a ________factor for plants
Biogeochemical cycles and the flow of energy through an ecosystem are the __________
You must eat a _________ to use solar energy for respiration and movement
________ involve both biotic and abiotic reservoirs
Nutrient with short-term biogeochemical cycle
A flea is involved in this type of symbiosis
_________ allows the flow of energy through an ecosystem to happen
Includes information about what an organism eats