Population Attributes

In the population growth curves shown below, ‘a’ and ‘b’ is representing:

Consider that plant species $\mathrm{P}$ is more efficient than plant species $\mathrm{Q}$ in nutrient uptake, but plant $\mathrm{Q}$ is a better seed disperser. In this example, the resource under competition is nutrient; but, nutrient acquisition is related to availability. If a disturbance opens up new space for colonization, plant $\mathrm{Q}$ is expected to arrive first and maintain its presence in the community until plant $\mathrm{P}$ arrives and begins competing with plant $\mathrm{Q}$. Eventually, plant $\mathrm{P}$ will outcompete plant $\mathrm{Q}$ because plant $\mathrm{P}$ is more efficient in nutrient acquisition and grows faster. With an increasing plant $\mathrm{P}$ population, the plant $\mathrm{Q}$ population will decline, and given enough time, has a possibility of shrinking in number in the present habitat. The way(s) of preventing the declining numbers of plant $\mathrm{Q}$ could be

You are provided with a bacterial culture (generation time of 30 minutes) in the exponential (logarithmic) growth phase. You transferred an aliquot of this culture to a fresh medium, which now contains $3.2\times {10}^6$cells/milliliter. Considering that this culture does not exhibit a lag phase, and growth conditions remain unchanged, the cells/millilitre that you would obtain after $1.5$ hours of incubation is

In a population of families having three children each, the percentage of population of families having both boys and girls is:

The following plots represent the body size distributions of a fruit fly population. Dashed lines represent the ancestral distributions and continuous lines represent the distributions after a few generations. If the larger individuals have better survival as well as higher reproductive rates, which diagram below best represents the expected change in the distribution of body size ($X$-axis represents body size while Y-axis represents frequency) 

Permanent outward movement of individuals is called

In the graph below, where $\mathrm{N}$ is population size and $\mathrm{t}$ is time, $\mathrm{M}$ represents

Species with high fecundity, high growth rates, and small body sizes are typically

According to the logistic population growth model, the growth rate is independent of

If 4 individuals are died and 8 individuals are born in a laboratory population of 40 fruit flies during time interval of 7 days, calculate the intrinsic rate of natural increase for fruit fly population per week

The density of the population will increase when:

To measure the population density of monarch butterflies occupying a particular park, $100$ butterflies are captured, marked with a small dot on a wing, and then released. The next day, another $100$ butterflies are captured, including the recapture of $20$ marked butterflies. One would correctly estimate the population to be

If most individuals in a population are young then why is the population likely to grow rapidly in the future$?$

Which of the following statements is correct?
a) The number of organisms can increase but never decrease once a population reaches its carrying capacity.
b) All population experience exponential growth once they reach carrying capacity.
c) A population always grows rapidly once it reaches its carrying capacity.
d) Limiting factors can influence the number of organisms in a population once it reaches its carrying capacity.

In a pond, there were $30$ lotus plants in last year. Through reproduction, $25$ new lotus plants were added by reproduction in one year while $8$ plants died. The birth and death rate for the lotus population respectively are ..... and ....... individuals per lotus per year.

If $4$ individuals have died and $8$ individuals are born in a laboratory population of $40$ fruit flies during a time interval of $7$ days, calculate the intrinsic rate of natural increase for fruit fly population per week.

Which of the following statement is true for an urn-shaped pyramid?