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प्रश्न
List the attributes that populations but not individuals possess.
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उत्तर १
Some characteristics of a population differ from those of individual members. Individuals are born and die, whereas populations have birth and death rates. Each population has distinct characteristics, including age distribution, genetic composition, and growth models. A population has a sex ratio, although individuals might be male or female.
उत्तर २
A population possesses several attributes that individuals do not have. These include population density (number of individuals per unit area), biotic potential (reproductive capacity of the population), environmental resistance (factors limiting population growth like predators and resources), population growth (changes in population size over time), carrying capacity (maximum population size the environment can sustain), population growth curve (pattern of population increase), age distribution, sex ratio, population dispersal, and population bioenergetics. These attributes collectively describe the dynamics and characteristics of a group of organisms living in the same area, which an individual alone cannot exhibit.
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संबंधित प्रश्न
(a) Name the two growth models that represent population growth and draw the respective growth curves they represent.
(b) State the basics for the difference in the shape of these curves
(c) Which one of the curves represents the human population growth at present? Do you think such a curve is sustainable? Give reason in support of your answer.
Study the graph given below and answer the questions that follow :
(i) Write the status of food and space in the curves (a) and (b).
(ii) In the absence of predators, which one of the two curves would appropriately depict the prey population?
(iii) Time has been shown on X-axis and there is a parallel dotted line above it. Give the significance of this dotted line
Represent diagrammatically three kinds of age-pyramids for human populations.
"Analysis of age-pyramids for human population can provide important inputs for long-term planning strategies." Explain.
Define the carrying capacity.
What is reproductive fitness? Explain it with the help of an example.
Mention the different ways by which the population density of different species can be measured.
The phenomenal and rapid increase of population in a short period is called ______.
Population having large number of postreproductive and small number of prereproductive age group is called
What parameters are used for tiger census in our country’s national parks and sanctuaries?
Which one of the following organisms reproduces sexually only once in its lifetime?
The density of a population in a habitat per unit area is measured in different units. Write the unit of measurement against the following:
Bacteria
The density of a population in a habitat per unit area is measured in different units. Write the unit of measurement against the following:
Deer
The density of a population in a habitat per unit area is measured in different units. Write the unit of measurement against the following:
Fish
What type of population growth is represented by the above age pyramid?
The following diagrams are the age pyramids of different populations. Comment on the status of these populations.
Given below is the Age Pyramid of the population in one of the states in India as per 2011 census. It depicts the male population on the left-hand side, female population on the right-hand side, newborns towards the base and gradually increasing age groups as we move from base to the top, with the oldest population at the top. Study this pyramid and comment upon the appropriateness of the Assertion and the Reason.
Percentage to the total population
Assertion: It is a stable population.
Reason: The pre-reproductive and reproductive individuals are almost in equal numbers and the post-reproductive individuals are relatively fewer.
Write the best method to measure the population density of a single Banyan tree in comparison to Partlzenium weeds in a forest by an ecologist. Explain and justify your answer.
What would be the best method to measure the total population density of a dense bacterial culture in a petridish and why?
With the help of neatly labelled diagrams, explain the different types of age pyramids of human population.
