Life Span of Some Organisms

Lifespan is a period from birth to the natural death of an organism. It can be vary from as short as few days to as long as number of years. Lifespan can not necessarily be correlated with sites of an organism i.e, it will be a misconcept to say that smaller organisms have shorter life span and larger organisms have longer life span.

 

Maximum life span

Maximum lifespan to the maximum number of years survive or the greatest age reached by any member of a species the average lifespan refers to the average number of years survived for age reached by the members of a population. Life expectancy, the number of years and the individual can expect to live for, is based on average life span. It can be defined as the age at which half the population state survive. Thus, maximum lifespan is the characteristic of species life expectancy is the characteristic of populations.

 

Maximum life span of wild animal

It is very difficult to estimate because science of senility for extreme old ages are feldom seen in them. Animals living under natural conditions really approach here maximum possible age because of very high death rates due to infant mortality, diseases, predators, bad weather , accidents or competition for food and shelter. For this reason the most reliable information about the duration of life sperm comes from Zoos, where accurate records are kept and animals live under conditions almost ideally suited prolong life. The maximum lifespan of domestic dog is about 20 years and that of a laboratory Mouse is 4.5 years.

 

The Maximum lifespan of Humans

It has been estimated to be about 121 years. This rest on the fact that the man in Japan, Shirechiyo Lzyni, reach the age of 120 years and 237 days in 1986. He died after developing pneumonia. Average lifespan and the expectancy of human have grown dramatically. In general, the rate of mortality of humans had gone down and the lifespan have increased it is 56 in India where as in the United States, it is 78.

 

The limited lifespan and mortality

Limited lifespan means that the death of every organisms is in editable i.e all individuals are mortal except single celled organisms. Despite The Limited lifespan and the motility of organisms, a variety of plant & animal species are well maintained on earth through the process of reproduction. Reproduction ensure the  continuity of strength species.

 

Some Knowledgeable Facts

One species of jellyfish, Pumitotsis Nutricula, reverts sexually immature stage after reproducing, rather than dying as a other Jelly fishes. Consequently this species is considered biologically immortal and has more maximum life span.

 

Women and to have a lower mortality rate at every age. In the womb male fetuses have a higher mortality rate (babies are concived in a ratio of about 124 males to 100 female but ratio of the surviving to birth is only 105 males to 100 femles).

 

Among the smallest premature babies (those under 2 pounds or 900 g) female again have a higher survival rate. At the other extreme about 90% of individuals aged 100 are female.

 

 

 

Lifespan of Some Selected Animals                                         Max. Span (years)

• Ant Queen                                                                                                       15
• Bull frog                                                                                                          30
• Toat                                                                                                                 36          
• Giant Salamander                                                                                           55
• Mud Puppy                                                                                                     23
• Cobra                                                                                                              28
• Turtle                                                                                                             123
• Humming bird                                                                                                  8
• Parrot                                                                                                             140
• Owl                                                                                                                  68
• Eagle                                                                                                                65
• Pig                                                                                                                    27
• Tiger                                                                                                                 25
• Lion                                                                                                                  30
• Dog                                                                                                                   20
• Chimpanzee                                                                                                      45
• Rhesus Monkey                                                                                                29
• Squirrel                                                                                                             16
• House Mouse                                                                                                   3.5
• House rat                                                                                                          4.2
• Horse                                                                                                                 62
• Elephant                                                                                                            70
• Fin Dack whale                                                                                                 80