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प्रश्न
The following diagrams are the age pyramids of different populations. Comment on the status of these populations.
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उत्तर
Fig.A: It is a ‘pyramid’ shaped age pyramid. In this figure, the base i.e pre- reproductive stage is very large when compared with the reproductive and past reproductive stages of the population. This type of age structure indicates that the population would increase rapidly.
Fig.B: It is an ‘inverted bell’ shaped pyramid. In this figure, the pre-reproductive and reproductive stages are the same. This type of age structure indicates that the population is stable.
Fig.C: It is ‘Urn’ shaped pyramid. In this figure, the pre-reproductive and reproductive stages are less than the post-reproductive stage of this population. In this population more older people are present. This type of age structure indicates that the population definitely is declining.
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संबंधित प्रश्न
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
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What is an age-pyramid?
Animals that can move from fresh water to sea called as ________.
Nutrient enrichment of water body result.
The phenomenal and rapid increase of population in a short period is called ______.
`"dN"/"dt" = "rN" (("K"- "N")/"K")` in logistic growth "K" represents:
Which of the following would necessarily decrease the density of a population in a given habitat?
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:
Banyan
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
Label the three tiers 1, 2, 3 given in the above age pyramid.
List any four characters that are employed in human population census.
Comment on the following figures: 1, 2 and 3:
A, B, C. D, G, P, Q, R, S are species
An individual and a population has certain characteristics. Name these attributes with definitions.
Identify the type of pyramid given above. Write the identifying feature on the basis of which you identified it.
Important attributes belonging to a population but not to an individual are:
- Birth rate and death rate
- Male and female
- Birth and death
- Sex-ratio
Select the correct option from the given options:
