biology practice questions exam 4 – Flashcards
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the sum of all Earth's ecosystems is called the ____.
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biosphere
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___ is credited with raising environmental awareness by writing the book "Silent Spring."
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Rachel Carson
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___ are the driest of all terrestrial biomes.
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deserts
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the greatest annual input and least seasonal variation in solar radiation takes place in the ___.
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tropics
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freshwater and seawater mix in an ___.
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estauary
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when a graylag goose makes the motion to move an egg back into its nest, even though the egg has been removed, it is executing ___.
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a fixed action pattern
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which of the following does NOT play a role in the evolution of mating systems? - imbalance between male/female gamete size - sexual dimorphism - certainty of paternity - needs of the young
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sexual dimorphism
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when you successfully study with the stereo on in the background, you are demonstrating ___.
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habituation
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when a juvenile bird gives up its chance to mate in order to help its parents raise its siblings, it is demonstrating ___.
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altruism
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a grayling butterfly will normally fly toward the sun. this is an example of ___.
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taxis
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a group of individuals of a single species that occupies the same general area defines a ___.
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population
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assume that there are 5 alligators per hectare in a swamp in northern Florida. this is a measure of the alligator population's ___.
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density
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the maximum number of individuals a habitat can support indefinitely is called the ___.
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carrying capacity
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what will be the approximate shape of the age-structure diagram of a decreasing population?
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an inverted pyramid
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an animal, such as a squirrel, that has a constant mortality over its lifespan exhibits a ___ survivorship curve
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type 2
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the feeding relationships among the species of a community is the community's ___.
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trophic structure
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a community is composed of ___.
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potentially interacting populations of different species of organisms
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the sum total of a species' use of the biotic and abiotic resources of its habitat constitutes its ___.
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niche
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coevolution is an outcome of ___ between two species.
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reciprocal adaptation
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what generally flows in one direction through an ecosystem, from producers up through each level of consumers, and is not recycled?
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energy
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today, the single greatest threat to biodiversity is ___.
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habitat destruction
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kangaroos are found only in Australia. thus, kangaroos are said to be ___ to Australia.
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endemic
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Chlorofluorocarbons (CFCs) ___.
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deplete the ozone layer
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burning fossil fuels and deforestation have resulted in an increase in the concentration of ___ in the atmosphere, which may be causing the global climate to change.
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CO2
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an important change in populations and species in response to climate change is ___.
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distribution
