Reproduction In Organisms.. Class - 12 NOTES. part-1.

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 1.> LIFE SPAN-   The period from birth to the natural death of an organism represents its life span.


           ORGANISM  --------------------------------  LIFE SPAN

    1] Banyan tree----------------200 yrs.

    2] tortoise-------------------100-150 yrs.

    3] parrot----------------------140 yrs.

    4] man----------------- 100 yrs.

       5]crocodile-------------60 yrs.

 555555] crow-----------------------15 yrs.

  6] wheat plant ---------------6 months.

   7] butterfly-------------------1-2 weeks

   8] mayfly---------------------1 day

                                     REPRODUCTION- 


Reproduction is a biological processes by which an organism produced another organism similar to its self.

TYPES OF REPRODUCTION -
                                     1) SEXUAL REPRODUCTION
                                     2) ASEXUAL REPRODUCTION

*) ASEXUAL - Asexual reproduction  does not involve formation or fusion  
of gametes.
2) it is simple and fast process.
3)it involve only mitosis.
4) it is always uniparental 

*) SEXUAL - Sexual reproduction involves formation and fusions of gametes.
2) it is elaborate, complex, and slow process. 
3) it involve meiosis.
4) it usually biparental (two parents)











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