Ecology MCQ Quiz

From the population dynamics point of view  what would be the effective population size of population 150 breeding female and 50 breeding males?

What will be the approximate effective population size in a panmictic population of 240 with 200 female and 40 polygamous males? (JUNE 2011)

A plot of dN/dt as a function of population density yields____ (DEC 2016)

For a species having logistic growth if K=20,000 and r=0.15, the maximum sustainable yield will be___ (DEC 2016)

The birth rates and death rates of an insects are 0.25 and 0.05 respectively. In a habitat with carrying capacity of 500 when the population density is 100 by how much does the insect population size increase per unit time if ‘a’ the growth is exponential and ‘b’ growth is logistic ?

A population is growing logistically with a growth rate (r) of 0.15/week, in an environment with a carrying capacity of 400. What is the maximum growth rate (N⁰) of individuals/ week that this population can achieve?

The population density of an insect species increases from 40 to 46 in a one month. If the birth rate during that period is 0.4 what is death rate? (DEC 2014)

The population size of a birth increased from 600 to 645 in one year. If the per capita birth rate of this population is 0.5, what is its per capita death rate ? (JUNE 2014)

If Gypsy moth egg density of an insect species is 160 at time ‘t’ and 200 at ‘t+1’, what will be its value at time t+3, assuming that egg density continues to increase at constant rate? (JUNE 2016)

Given below are growth equations where dN/dt is defined as____.

A) rN/K

B) rN

C) rN[(K-N)/N]

D) rN[(K-N)K]

With reference to the above equations, which one of the following statements is correct ? (DEC 2017)

In the following equations

A) dN/dt = rN

B) Nt=N⁰ert

C) dN/dt = rN(K-N/K)

D) dN/dt= rN × N/K

Exponential population growth is described by (DEC 2015)

In a population growing logistically and approaching carrying capacity (K), the change in density (N) per unit time  (dN/dt) is maximum when N is equals to ___.

The net reproductive rate (R⁰) is 1.5 for a given population. If Nt, population of females at generation t is 500, then what will be the population of female after 4 generations (Nt+4) ? (JUNE 2017)

Two species of plants sample in 32 quadrants in a forest. The mean and variance for the occurrence of species 1 were 16.2 and 48 species 2 were 3.6 and 3.2 respectively. Which of the following statements about the distribution of two species in the same quadrant is supported by this finding.

A grasshopper population is being assessed by captured-mark-release-capture method. On the first day 100 grasshoppers were captured, and released. And on the next day during recapture 10 marked and 90 unmarked grasshoppers could be found in same time period from the same area. What will be the estimated population size in the given area ? (JUNE 2013)

In an experiment to determine the number of rats in a field, 80 rats were initially captured, marked and released. After 1 month, 100 rats were captured in the same field of which 20 were previously marked ones. Based on the above observations estimate population size of rats in the field will be: ( JUNE 2017)

In a census for a lake fish, 10 individuals were marked and released. In second sampling after a few days 15 individuals were caught of which 5 individuals where found marked. The estimated population of the fish in the lake will be (DEC 2012)

You observe the species of barnacles, species 1 and species 2, occupy upper and lower strata of intertidal rocks, respectively. Only when species 2 was removed by you from the lowest strata, species 1 could occupy both upper and lower strata. From the choice given below what would be your inference from these observation. (DEC 2016)

In a 2 species interaction, assume that it leads to competition in habitat A, but to facilitation in habitat B. Which of the following is true about niches of these species?

Gause’s ‘competitive exclusion principle’ states that two species with identical neiches cannot coexist indefinitely. Which of the following statements is the most appropriate regarding the validity of the principle? (JUNE 2011)

The Hutchinsonian concept of ecological niche is based on ____ (DEC 2011)

Individuals with greater mass have a smaller surface area to volume ratio. Which helps to conserve the heat this is known as… (DEC 2014)

Which of the following statement is most appropriate example of character displacement ?

Ecological compression differs from character displacement in that it operates on a____ (DEC 2011)

Individuals occupying a particular habitat and adapted to it phenotypically but not genotypically are known as … (2016)