Life Span

The period from birth to the natural death of an organism represents its life span. Life span is a specific trait of each organism. Life span varies from few days to several thousand years. Life spans are not necessarily correlated with size or complexity of organisms. As for example, crow and parrot are of almost equal size, but crow has a life span of only 15 years while parrot lives for about 140 years. Similarly mango tree lives for 200 years while peepal has a life span of about 2500 years. Figure given below gives appropriate life spans of some organisms.

Whatever be the life span, the death of every organism is sure, which means no individual is living forever So we can say living organisms are mortal. Now a question arises, /s this true for single-celled organisms Also? No, single-celled organisms when they grow up they undergo division i.e., a mother cell divides into Two daughter cells. No body part is left to die. So they simply get larger and then divide which is not Considered as death. Such organisms are immortal.

Life Span of Some Organisms– Examples

Organisms	Life span (maximum)
May fly	24 hours
Butterfly	1-2 weeks
Fruit fly	30 days
Rice plant	4 months
Rat	4 years
Rabbit	13 years
Crow	15 years
Dog	25 years
Monkey	26 years
Cat	35-40 years
Horse	50 years
Elephant	60-75 years
Humans	100 years
Tortoise	100-150 years
Peepal	2000-3000 years