Unit 9 Target 2: Habitat, Niche, And Resources

Which of the following would not be included in a description of an organism’s niche?a.    its trophic level    b.    the humidity and temperature it prefers    c.    its number of chromosomes    d.    when it reproduces

Competitive exclusion occurs whena.    a species is eliminated from a community because of competition.    b.    new species enter an ecosystem because one of the original species died off.    c.    species reproduce in increasing numbers because more food is available.    d.    All of the above

The specific physical location in which a given species lives is called itsa.    habitat.             c.    community.    b.    abiotic factor.    d.    climate.

Which of the following is a density-independent limiting factor?a.    food      c.    severe weather    b.    water    d.    number of nesting sites

An organism’s niche isa.    the range of physical and biological conditions in which an organism lives and the way in which it uses those conditions.    b.    all the physical and biological factors in the organism’s environment    c.    the range of temperatures that the organism needs to survive.    d.    a full description of the place an organism lives.

A biotic or an abiotic resource in the environment that causes population size to decrease is a  a.    growth factor.           c.    limiting nutrient.    b.    carrying capacity.    d.    limiting factor.

Each of the following is a density-independent limiting factor EXCEPTa.    natural disasters.       c.    seasonal cycles.    b.    availability of water.    d.    human activity.

Which would be LEAST likely to be affected by a density-dependent limiting factor?a.    a small, scattered population                  c.    a population with a high birthrate    b.    a population with high immigration rate    d.    a large, dense population

Which of the following is a renewable resource?a.    biodiversity    c.    oil    b.    water            d.    coal

Different species can share the same habitate, but competition among them is reduced if theya.    reproduce at different times.    c.    increase their populations.    b.    eat less.                                d.    occupy different niches.

No two species can occupy the same nich in the same habitat at the same timea.    because of the interactions that shape the ecosystem.    b.    because of the competitive exclusion principle.    c.    unless the species require different biotic factors.    d.    unless the species require different abiotic factors. 

A biologist recorded the number of rabbits in a population over 30 generations. Which of the following statements best explains why the number of rabbits in the population dramatically devreased between Points A and B?Shortly after the 10th generation:a.  a new predator that feeds solely on the rabbits’ main competitor was introduced into the rabbits’ habitat.    b.  area farmers set traps for coyotes, the rabbits’ main predator.    c.  a change in environmental conditions led to a significant increase in the amount of food available to the rabbits.    d.  a fatal disease infected a large proportion of the rabbits in this population.