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Unit one exam
Terms in this set (51)
How do feedback loops help organisms respond to the environment?
How are behavioral feedback loops coordinated among multiple mechanisms in an organism?
How is response to a stimulus a vital part of an organism's evolutionary fitness?
Which are examples of major responses in both plants and animals?
what is the definition of fitness?
what is raw instinct
what is a stimulus
what is abiotic? Examples?
what is biotic? Examples?
What is phototropism?
response to light
What is photperiodism?
changes in an organisms behavior due to the length of day or night
what is melatonin?
What are taxis?
Movement toward or away from a stimulus.
What is phototaxis?
movement towards or away from light
What is chemotaxis?
movement of an organism in response to a chemical stimulus
What is kinesis?
random movement in response to a stimulus
What is Quarum sensing?
The process in which bacteria monitor their own population density by sensing the levels of signal molecules released by microorganisms.
what is an organism
A living thing
What is proximate?
the immediate cause
What is ultimate
why a behavior occurs
whta is r selected
Selection for traits that maximize reproductive success at low population densities
What is a k-selected species?
A species that lives at a population density near their carrying capacity, produce a few large, well developed young, provide parental care, slow growth, delayed maturation, reproduction of offspring; long gestation
How are communities structured?
How do the interactions of species in a community lead to emergent properties?
What is the relationship between community diversity and stability?
How do keystone species affect the stability and structure of food webs?
Which aspects of a community put limits on the length of food chains?
What is a niche?
The role of an organism in its habitat
What is a fundamental niche?
the niche potentially occupied by a species
What is a realized niche?
The environmental conditions in which an organism is living at a given time.
What is cryptic coloration?
What is aposymatic coloration?
warning coloring for dangerous features
What is Batesian mimicry?
a harmless species mimics a harmful one
What is mullarian mimicry?
two or more harmful species with similar predators mimic each other
what is herbivory
An interaction in which one animal feeds on producers
What is a trophic level?
Each step in a food chain or food web
What is a keystone species?
a species on which other species in an ecosystem largely depend, such that if it were removed the ecosystem would change drastically.
How does plant transpiration correlate with the diversity of an ecosystem?
Which factors are involved in the movement of water from roots to leaves and out into the atmosphere?
How do plants use water potential to their advantage to create flow into roots?
In what ways have plants adapted to limit the amount of transpiration in dry environments?
Which environmental factors seem to favor higher rates of transpiration?
How can water potential be used to predict the movement of water across cell membranes?
What are feedback loops?
Occur when an output of matter, energy, or information is fed back into the system as an input and leads to changes in that system
What is resource partitioning?
the differentiation of niches that enables similar species to coexist in a community
What is the greenhouse effect?
the trapping of the sun's warmth in a planet's lower atmosphere
What is adhesion?
the clinging of one substance to another
What is cohesion?
an attraction between molecules of the same substance
What is solute potential?
the tendency of water to move by osmosis
what causes water to move to a plant's leaves?
adhesion, cohesion,and transpiration
what is seasonality
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