Question

When a person dies in old age after completing its life span the survivorship curve is
A) J-shape
B) Concave
C) S-shape
D) Convex

Answer 1

Hint: Survivorship curve is a graph that shows the number of populations of individuals surviving to each age group. The survival ship can be plotted for a given group of individuals please the same age based on their life table. In mathematical statistics, the survival function is one specific form of survivorship curve that plays a part in survival analysis.

Complete answer:
There are three types of survivorship curves
1. Type I or convex curves: It shows that the individual has a high rate of survival until adulthood in middle age because of parental care and protection followed by a decline in humans and many other large mammals come under this group.
2. Type II or diagonal curve: it shows that the survival of an individual is not dependent upon age. It shows steady growth. Some birds and lizards come under this group.
3. Type III or concave curves: It shows that an individual at an early age has fewer chances of survival and dies at an early age followed by an increase in their survival when at a later age. Mostly marine like oysters, various plants come under this group.
Hence, option D is the correct answer.

Note: The number of proportions of an organism surviving irrespective of their age is plotted on the y-axis. Generally, it is an algorithmic scale starting with the value of thousand individuals, while their age or their maximum life and is plotted on the x-axis.