- Butterflies and moths both feed on flowers. Butterflies feed during the day,
and moths feed at night. This is an example of (A) r-strategy
(B) K-strategy
(C) resource partitioning
(D) commensalism
(E) mutualism
- The LD 50 (or median lethal dose) is the lethal dose of a toxin, radiation, or
pathogen required to kill half the members of a tested population after a
specified time. If the acute toxicity of compound X is reported as LD 50 = 5
mg/kg body weight, which of the following statements is always true?
(A) A 1 mg/kg dose is 100% safe and will not cause death.
(B) A 2.5 mg/kg dose will kill 50% of the members of the tested population.
(C) A 5 mg/kg dose will kill 50% of the members of the tested population.
(D) A 10 mg dose will kill 100% of the members of the tested population.
(E) Any dose of compound X will kill at least half of the tested population.
- Which of the following organisms listed below would be MOST at risk for
accumulating fat soluble pesticides?
(A) Aquatic plants
(B) Cattle
(C) Hawks
(D) Protozoa
(E) Bees
- Which of the following examples demonstrates a negative feedback loop?
(A) Increased technology in agricultural science produces more food
resources, resulting in a higher birth rate (B) Frequent large fires can
increase atmospheric greenhouse gas concentrations, causing more
warming and drought, and leading to more fires, which reduce the trees
available to store carbon (C) A thermostat working to keep a home at
68°F during the winter
(D) A nuclear chain reaction
(E) A, B, and D
- Demographic transition leads to stabilizing population growth and is
generally characterized as having four separate stages. Place the following
