WSU BIO 106 FINAL UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
COMPLETE STUDY GUIDE
●● 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
Answer: deven chance of death at any age
●● Type 3 survivorship curve
QUESTIONS AND CORRECT ANSWERS
COMPLETE STUDY GUIDE
●● 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
Answer: deven chance of death at any age
●● Type 3 survivorship curve
