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Organisms And Populations

Question
CBSEENBI12047480

Given below is the survivorship curve of different population.

Which type of the curve has the highest chances of senescence affecting mortality?

  • Type I

  • Type I and II

  • Type III

  • Type I, II and III

Solution

A.

Type I

Curve I shows an almost ideal curve for a population in which senescence is the major factor affecting mortality. This curve would also be obtained for an annual crop plant such as wheat, where all the plants in a given field survive well early in life and then senescence simultaneously.

Curve II is an intermediate between curve I and III. In this, mortality rate is constant.

Curve III is lowest age and has a specific survival. It occurs early in life.