LIFE SPAN IN ORGANISM
- CLASS – 12TH BIOLOGY
- UNIT – 1ST REPRODUCTION
- CHAPTER- 01 REPRODUCTION IN ORGANISM
- TOPIC – LIFE SPAN ( जीवन अवधि )
LIFE SPAN
- THE PERIOD FROM BIRTH TO THE NATURAL DEATH OF AN ORGANISM CALLED LIFE SPAN .
- EACH ORGANISM HAS A SPECIFIC AVERAGE LIFE SPAN.
- IT MEANS EACH ORGANISM GROW AND LIVES FOR A PARTICULER LENGTH OF TIME .
- LIFE SPAN MAY RANGE FROM ONE DAY TO 4000 YEARS.
- PLANTS GENERALLY HAVE GREATER LIFE SPAN COMPARED TO ANIMAL .
- CAN YOU GIVE ANSWER WHY ?
- ANSWER – BECAUSE THE PLANTS CONTINUE TO GROW AT THERE TIPS EVEN WHEN A LARGE PART OF THERE CONSIST OF DEAD CELLS
- THERE IS GREAT VERIATION IN THE LIFE SPAN OF LIVING ORGANISM.
- GENERALLY BELIEVED THAT THE LIFE SPAN OF LARGE ANIMAL IS GREATER THAN SMALL ANIMAL.
- IT IS NOT TRUE – NO CORELATION BETWEEN LIFE SPAN AND THERE SIZE.
EX. ELEPHENT -70 YEAR , HIPPOPOTAMUS -50 YEARS, HORSE – 45 YEARS, GORRILLA -25 YEARS
STAGES OF LIFE SPAN-
- THERE ARE FOUR STAGES IN THE LIFE SPAN
JUVENILITY – THIS REPRESENTS THE STAGE BEFORE THE ORGANISM DEVELOPS THE CAPACITY TO REPRODUCE. IT MEANS IT IS THE PERIOD PRIOR TO REPRODUCTIVE STAGE.
MAURITY- IN THIS STAGE REPRODUCTION START.
AGEING – PROGRESSIVE DETERIORATION IN BODY OF AN ORGANISM
DEATH- IT MEANS THE ALL VITAL ACTIVITIES ARE ENDED.
AVERAGE LIFE SPAN OF SOME LIVING BEINGS-
- MAY FLY – 1 DAY
- GORILLA -25 YEARS,
- HORSE – 45 YEARS,
- SILK MOTH- 1-3 DAYS
- RHINOCEROS -50 YEARS
- HIPPOPOTAMUS- 50 YEARS
- RICE -4 MONTHS
- INDIAN ELEPHANT – 70 YEARS
- OWL- 70 YEARS
- WHEAT- MONTHS
- MAN- 70 YEARS (100years )
- PARROT – 140 YEARS
- SHREW – 1 YEAR
- TORTOISE- 300 YEARS
- BANYAN- 200 YEARS
- HOUSE MOUSE- 2 YEARS
- OAK – 500 YEARS
- PEEPAL – 2000 YEARS
- CHIPMUNK -5 YEARS
- SEQUOIA- 3000 YEARS
- RABBIT- 13 YEARS
- DOG AND CAT -15 YEARS ( 20-30 years)
- BLACK BEAR-25 YEARS
WHAT YOU LEARNT ?
WHAT IS LIFE SPAN ?
STAGES OF LIFE SPAN.
EXAMPLE OF AVERAGE LIFE SPAN OF SOME LIVING BEINGS
FIND OUT THE LIFE SPAN OF SOME ORGANISM.
ATTEMPT QUIZ
