Q3 of 70 Page 95

The following diagrams are the age pyramids of different populations. Comment on the status of these populations.


The given figures represent a population pyramid. The base is the pre-reproductive population.Mid part is the reproductive population and the top is the post reproductive population.

Figure ‘A’ is a pyramid shaped figure. This structure has a larger base than the mid and the top. This large base indicates greater pre-reproductive population than reproductive and post reproductive population.


Status: This shape indicates population would grow rapidly.


Figure ‘B’ is an inverted bell-shapedpyramid. Inthis both pre-reproductive and reproductive population is the same.


Status: This shape indicates population is stable.


Figure ‘c’is an urn shaped pyramid. The pre-reproductive and reproductive population is lesser than the post reproductive population. They have more older people than young generation.


Status: This shows that the population is declining.


More from this chapter

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1

Comment on the following figures: 1, 2 and 3:

A, B, C. D, G, P, Q, R, S are species



 2

An individual and a population has certain characteristics. Name these attributes with definitions.

 4

Comment on the growth curve given below.


 5

A population of Paramoecium caudatum was grown in a culture medium. After 5 days the culture medium became overcrowded with Paramoeium and had depleted nutrients. What will happen to the population and what type of growth curve will the population attain? Draw the growth curve.