Population Density

Mimicry | Populations and Populations Density

Abiotic and Biotic Factors | Soil texture | Mimicry | Populations Density

Assertion: The number of fish caught per trap is good enough measure of its populations density in the lake. Reason: For certain ecological investigations, there is no need to know the absolute populations densities, relative densities serve the purpose equally well.

List the different attributes that a population has and not an individual organism. ( b) What is population density? Explain any three different ways the population density can be measured ,with the help of an example each .

Assertion : A population growing in a habitat with limited resources shows initially a lag phase, followed by phase of accelerated and deceleration and finally as asymptote, when the population density reaches the carrying capacity. Reason : In Verhulst-Pearl Logistic growth, plot of N (population density) at time (t) results in a sigmoid curve.

Density of population D is

Density of population increases when________.

In a population of an area, the difference in the natality rate and mortality rate is zero in a particular year, but the population density has decreased. Which of the following may be the reason for this decrease ?