Question

okay so I took this quiz and these are the answers I put. there are 13 questions but I am not sure what I am getting wrong. all I know is I got 9 out of 13 right.

• A population's dispersion pattern is related to

1. the likelihood of competition between individuals.
2. individuals' chance of finding a mate.
3. Both
4. neither

• A population has the greatest number of individuals

1. when numbers are near (or at) the carrying capacity.
2. when numbers are near half of the carrying capacity.
3. when numbers are at a minimum (near zero)
4. (none of the above - population sizes do not change.)

• A population's growth rate is likely to be highest

1. when numbers are near (or at) the carrying capacity.
2. when numbers are near half of the carrying capacity.
3. when numbers are at a minimum (near zero)
4. (none of the above - population growth rates do not change.)

• The size of a population

1. always increases to a maximum, then remains constant for ever.
2. may increase and decrease cyclically.
3. always increases to a maximum, then decreases to zero.
4. (none of the above)

• A life table is useful for

1. describing changes in population size over a range of time.
2. describing the range of individual reproductive rates in a population.
3. (both)
4. (neither)

• As song sparrow population density increases,

1. the average reproductive success of individual song sparrows tends to increase.
2. the average reproductive success of individual song sparrows tends to decrease.
3. the average reproductive success of individual song sparrows does not change.
4. the average reproductive success of individual song sparrows is unpredictable.

• Mosquitos have a life history that is near the extreme of

1. r-selection.
2. K-selection.
3. (both)
4. (neither)

• During the early and middle twentieth century, there was

1. a sharp increase in human birth rate.
2. a sharp decrease in human death rate.
3. (both)
4. (neither)

True/False:

• If you ask a population ecologist, all the individuals in a population belong to the same species. : True
• A single population might exist in multiple territories that do not overlap, with no migration of individuals between territories.,true
• A population's carrying capacity depends on the action of parasites. fasle
• Most populations have a random dispersion pattern. False
• In general, animals are most likely to die at an age near their maximum possible lifespan. fasle

Answer 1

Answer -1.

Correct option. (C) - both

Explanation : Competition between individual for their life resource and chances of individuals to find a mate these two factors comes under intraspecific interaction within population which likely to effect the pattern of population dispersion over an area.

Answer - 2.

Correct option - (A).

Explanation :

Carrying capacity is the maximum number of individuals of a population can hold under the available resources in an environment or ecosystem and beyond that capacity the number can not grow further due to lack of resources and competition.

And thus, at carrying capacity the number of individuals are highest.

Answer - 3.

Correct option - (B).

Explanation :

The highest growth rate of a population is at when it reaches its half of carrying capacity.

Because at half carrying capacity, the number of individual are half to the maximum possible sustainable value and further growth is possible because available resources and number of individuals are at optimal levels of growth.

And when it reach at carrying capacity,  growth rate decline due to lack of resources and population size reach the maximum where further growth is not possible.

Answer - 4.

Correct option - (B)

Explanation :

The size of a population depends upon a number of growth factors and it is likely to increase or decrease in cyclic manner.

Answer - 5.

Correct option - (C)

Explanation :

Life tables are useful in estimating growth of population at different ages death rate, birth rate and reproductive rates of individual population are utilized for measuring the growth rate of population.

Answer - 6.

Correct option ( B).

Explanation :

As the Song Sparrow population density increase, there is a decline in the available resources with every increase in the population density which results into the decrease in the average reproductive sucess of individual song Sparrow, due to increase in intraspecific competition for the available resources within the area.

Answer - 7.

Correct option - (A) r - selection.

Mosquitoes have life history near the extreme of r - selection startergie.

Mosquitoes show r - selection , it produce early and large number of offspring due to low survival rate.