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UBCO BIOL 201 Evolution and Ecology Exam Questions and Answers
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UBCO BIOL 201 Evolution and Ecology Exam Questions and Answers Type 1 Survivorship Curve - ANSWER-High survivorship in young, physiological survivorship, usually seen when no external death factors, Ex. humans, elephants Type 2 Survivorship Curve - ANSWER-Constant linear decline survivorship, c...

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  • November 4, 2024
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Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024




UBCO BIOL 201 Evolution and Ecology

Exam Questions and Answers


Type 1 Survivorship Curve - ANSWER✔✔-High survivorship in young, physiological survivorship, usually

seen when no external death factors, Ex. humans, elephants


Type 2 Survivorship Curve - ANSWER✔✔-Constant linear decline survivorship, constant mortality

throughout lifetime, Ex. squirrels


Type 3 Survivorship Curve - ANSWER✔✔-High mortality in young, adults produce large amounts of

offspring in order to combat the high youth mortality, Ex. sea turtles, frogs, sea urchins


Intrinsic Growth Rate - ANSWER✔✔-Exponential growth model, exponential growth without limitation,

rarely occurs in nature, Ex. whooping crane


Realized Growth Rate - ANSWER✔✔-logistic growth model, incorporates carrying capacity (K) into the

mathematical equation where the population is limited by factors such as density or resources and stops

growing


Demographic Stochasticity - ANSWER✔✔-Randomness with respect to events that affect an individual's

birth and death rates


Environmental Stochasticity - ANSWER✔✔-Randomness with respect to the environment, can affect the

whole population, such as year-to-year conditions that vary




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Semelparity - ANSWER✔✔-No more than 1 single reproductive event in a lifetime, usually followed by

death, ex. salmon spawning


Iteroparity - ANSWER✔✔-Multiple reproductive events within a lifetime, ex. many bird species


Fast-Slow Continuum Hypohthesis - ANSWER✔✔-Predicts contrasting conditions of high vs low adult

mortality, ex. high mortality= fast development, shorter lifespan, higher fecundity


r selecting - ANSWER✔✔-Where r is the capacity of a population to exhibit growth. r is selected in

variable habitats that favour short-lived organisms that develop rapidly and reproduce early,

unpredictable habitats, ex. water pools that soon dry up


K selecting - ANSWER✔✔-Where K is limitations imposed on a population by factors such as resource

availability. K is selected for in relatively constant habitats, favour long-lived competitive organisms that

develop slowly and reproduce later, predictably patchy or seasonal habitats


Grime's Hypothesis - ANSWER✔✔-States that organisms are more adapted to deal with competition,

disturbance, or stress, and less able to deal with the two that they are not adapted to. Ex. Muskox are

stress adapted, adapted to deal with metabolic rates affected by a cold climate


Plesiomorphic Trait - ANSWER✔✔-Trait is present because of shared ancestry, ancestral character state


Apomorphic Trait - ANSWER✔✔-Trait defines a clade constituting a single species, shared

apomorphies/synapomorphies define clades, derived characters of a clade


Homoplasy - ANSWER✔✔-Convergent evolution, similar features arisen in separate groups that do not

come from an shared common ancestor, ex. bird wings and bat wings, duck bills and platypus bills,

endothermy in birds and mammals




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