Welcome to the NCERT Solutions for Class 12 Biology - Chapter Organisms and Population. This page offers a step-by-step solution to the specific question from Exercise 0, Question 3: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.
The following diagrams are the age pyramids of different populations. Comment on the status of these populations.
Population is divided into three important age classes: Pre- reproductive, Reproductive and Post- reproductive. An age pyramid is a graphical representation which shows the number and the proportion of the individuals that belongs to various age classes in a population of an individual at the given time. There are three types of age pyramid: Upright broad based pyramid, Bell shaped pyramid and Urn shaped pyramid.
Figure A is the Upright broad base pyramid which represents the expanding population with the high birth rate. It shows high proportion of pre- reproductive age class individuals than the reproductive and post- reproductive age class; which gives pyramid shaped age structure.
Figure B is the Bell- shaped pyramid which represents the stable population which contains moderate proportion of young to old population. Pre- and reproductive age class becomes equal in size and the post- reproductive remains small in size which makes this pyramid bell shaped.
Figure C is the Urn- shaped structure pyramid which shows declining population. It contains low proportion of pre- reproductive age class individuals due to low natality in comparison to reproductive and post- reproductive age class.
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