WSU BIO 106 FINAL UPDATED SCRIPT
COMPLETE QUESTIONS AND VERIFIED
SOLUTIONS
◉ Keystone species.
Answer: play a surprisingly important role structuring the
community given their relatively low abundance. may be habitat
modifiers, keystone predators or keystone herbivores
◉ Beavers are keystone species. What makes them have a large
influence.
Answer: They are habitat modifiers
◉ What do heterotrophs get energy and nutrients from?.
Answer: consumption
◉ What is the exponential growth curve?.
Answer: j-shaped
◉ What happens are population grows?.
Answer: competition for limited resources increases, population hits
the carrying capacity and levels off
,◉ What is carrying capacity?.
Answer: the population size an environment can support
◉ What is the logistic growth curve shape?.
Answer: s-shaped: environmental factors increase death rate and/or
reduce birth rate
◉ What are some factors that increase death rates or reduce birth
rates?.
Answer: density independent factors and density dependent factors
◉ Density independent factors.
Answer: individuals affected regardless of population size or density
◉ Density dependent factors.
Answer: factors that limit population growth more strongly at high
densities than low densities. these factors determined by carrying
capacity
◉ Where do consumers get energy and nutrients from?.
Answer: food
, ◉ What do consumers use energy and nutrients for?.
Answer: maintain cell functions. use leftovers for growth and/or
reproduction
◉ How a species allocates its energy between reproduction
determines.
Answer: how fast the population grows
◉ Limited energy means.
Answer: there are trade-offs in what you can do with it
◉ Opportunistic species (r-selected).
Answer: have combos that maximize rapid population growth
◉ Equilibrial species (k-selected).
Answer: have combos that maximize competing for limited
resources
◉ Type 1 survivorship curve.
Answer: survival is high at all ages and death by old age is typical
◉ Type 2 survivorship curve.
COMPLETE QUESTIONS AND VERIFIED
SOLUTIONS
◉ Keystone species.
Answer: play a surprisingly important role structuring the
community given their relatively low abundance. may be habitat
modifiers, keystone predators or keystone herbivores
◉ Beavers are keystone species. What makes them have a large
influence.
Answer: They are habitat modifiers
◉ What do heterotrophs get energy and nutrients from?.
Answer: consumption
◉ What is the exponential growth curve?.
Answer: j-shaped
◉ What happens are population grows?.
Answer: competition for limited resources increases, population hits
the carrying capacity and levels off
,◉ What is carrying capacity?.
Answer: the population size an environment can support
◉ What is the logistic growth curve shape?.
Answer: s-shaped: environmental factors increase death rate and/or
reduce birth rate
◉ What are some factors that increase death rates or reduce birth
rates?.
Answer: density independent factors and density dependent factors
◉ Density independent factors.
Answer: individuals affected regardless of population size or density
◉ Density dependent factors.
Answer: factors that limit population growth more strongly at high
densities than low densities. these factors determined by carrying
capacity
◉ Where do consumers get energy and nutrients from?.
Answer: food
, ◉ What do consumers use energy and nutrients for?.
Answer: maintain cell functions. use leftovers for growth and/or
reproduction
◉ How a species allocates its energy between reproduction
determines.
Answer: how fast the population grows
◉ Limited energy means.
Answer: there are trade-offs in what you can do with it
◉ Opportunistic species (r-selected).
Answer: have combos that maximize rapid population growth
◉ Equilibrial species (k-selected).
Answer: have combos that maximize competing for limited
resources
◉ Type 1 survivorship curve.
Answer: survival is high at all ages and death by old age is typical
◉ Type 2 survivorship curve.
