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प्रश्न
How does an age pyramid for human population at given point of time helps the policy-makers in planning for future.
उत्तर
The structure of the age pyramid determines the growth status of the population, that is, whether it is growing, stable or declining. On the basis of the collective information, the polices for the population can be decided. These may emphasise on providing food to the population, development of proper health services and much more.
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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
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.
Nutrient enrichment of water body result.
`"dN"/"dt" = "rN" (("K"- "N")/"K")` in logistic growth "K" represents:
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
An individual and a population has certain characteristics. Name these attributes with definitions.
With the help of neatly labelled diagrams, explain the different types of age pyramids of human population.
The number of lily plants in a pond was found to be 50. After one year, the number. increased to 65. Calculate the natality of lily plants.
