Know all About "Reproduction in Organisms"

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 Chapter -1  

Reproduction in Organisms /-

Birth <--  Life span --  Natural death of an organisms.
  • No individual is immortal except single called organisms. 
Life span of important organisms /- 
 
  • Butterfly -- 1 to 2 weeks
  • Fruit fly -- 30 days
  • Banana tree -- 30 years
  • Banyan tree --  300 years
  • Crocodile -- 60 years
Organisms habitat, its internal physiology.
Responsible for how it reduces.

Reproduction -- 

  • Sexual / 2 parents, gametes formation - gametes fusion.
  • Asexual / 1 parents, with / without gametes formation.

Asexual reproduction /- 

Common among unicellular organisms and in plants and animal with simple organisms.


  • Offsprings are known as clones (morphology and genetically similar).
Binary fission :-  Amoeba, Paramecium.
Budding :-    Yeast.

  1. In fungi and similar plants a sexual reproduction structure at present.
Zoospores :- 
                        Most common , Motile. Eg, Chlamydomonas.

  • Conidia :-. Penicillium
  • Buds : Hydra 
  • Gemmules : Sponges 
For Animals ;- asexual reproduction. 
For plants ; Vegetative reproduction. 

Eyes : Potato 
Rhizome :. Ginger, banana (from nodes of modified stem).
Bulbul : Agave 
Leaf Buds  :-  Bryophyllum (from the margin of leaves).
Offsets :. Water hack in most in invasive weed of standing water.

  • Drives of O2 formation of water.
  • Causes death of fishes.
  • Was introduced in India because of its beautiful flower and shape of leaves.
  • Can propagate vegetatively at phenomenal rates.
In adverse, condition, organisms having simple organisation.
Eg. Alage & Fungi.

Sexual reproduction/- 

                                        Elaborate, complex & slow process.
• diverse organisms --> Different greatly in external morphology internal structure Phisiology.  

But show similar pattern when it comes to sexual of reproduction. 

Birth -- (Juvenile) --> Organisms can produce (reproduction) -- (sensent phase) --> Death

Inter flowering period in plants that show flowering more than once in not a part of Juvenile phase, but nature phase. 
  • Annual Plants /- (Full life cycle in at most one years). 
  • Biennial plants/-. (Take more two years). 
  • Perennial Plants :-  (live for more than 2 years ).  -- no clear distinct present here --> Unusual flowering phenomenon.

Bamboo Species /-  Flowers XI in life time after 50-100 years & then die. 
Strobilanthus Kunthiana :-  flower Plant  once in 12 years. (Neelakurenji) --> Blue stretches in Kerala. 
Karnataka & Tamil Nadu.  



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