Question

when a population of organisms exceeds the carrying capacity, the population will
grow logistically
decine
remain stagnant
grow logarithmically
6
multiple choice 1 point
which of the following is the best description of commensal symbiosis?
both species benefit from the interaction.
neither species benefits from the interaction.
one species benefits from the interaction, and the other is unaffected.
one species benefits from the interaction at a cost to the other species.
7
multiple answer 1 point
which of the following does affect population size in a given community? (choose all that apply)
intraspecific competition
parasitism
pleiotropic signaling
predation
interspecific competition
8
multiple choice 1 point
what are the two primary parameters used to describe a population within a given habitat at a given point in time?
population size and density
population growth and carrying capacity
population birth and death rates
population range and life expectancy

Explanation:

• Question 6: Commensal symbiosis is defined as a relationship where one species benefits and the other is unaffected.
• Question 7: Intraspecific competition (competition within a species), parasitism (one organism benefits at the expense of another), predation (one organism eats another), and interspecific competition (competition between species) all affect population size. Pleiotropic signaling is related to gene expression and not population size.
• Question 8: Population size (number of individuals) and density (number of individuals per unit area/volume) are the two primary parameters to describe a population at a given time and habitat.

Answer:

• Question 6: One species benefits from the interaction, and the other is unaffected.
• Question 7: Intraspecific competition, Parasitism, Predation, Interspecific competition.
• Question 8: population size and density.