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Organisms and Environment - II


  • It is a group of organisms inhabiting a given area.

  • Attributes of population are –

    • Birth rate

    • Death rate

    • Sex ratio

    • Age distribution

  • Age pyramid: It shows the age distribution pattern for a population.

  • Age pyramid for human population shows –

    • Expanding population: Has a broader base, representing more number of individuals in pre-reproductive (young individuals) age group

    • Stable population: Has almost equal number of individuals in the pre-reproductive and reproductive age groups, converging at the post-reproductive age group

    • Declining population: Has lesseā€¦

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