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(1) Characteristic  (Character)

Dictionary of botanic terminology - index of names

     
  A characteristic is a prominent aspect of something, a distinguishing measurable, physical, chemical, visual, functional recognizable quality, property, feature, or capability.  
     
(2) Characteristic [ Biology ]
     
  In biology a characteristic is any feature of an organism or of an organ that can be measured, counted or otherwise assessed.  
     
(4) Characteristic (Genetic character)   [ Genetics ]
Synonym: Genetic attributes
     
  In genetic character is a feature  that is the expression of a gene or group of genes,  An attribute resulting from the interaction of a gene or genes with environment.  
     
(3) Characteristic ( Population characteristic )  [ Ecology ]
     
  In ecology a population characteristic is something we want to estimate about a population.  
     
Common examples of population characteristics are totals and averages for variable like the age, dimension, sex, fertility, reproduction rate, death rate etc)


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Holdfast roots  [ Botany  ]

Dictionary of botanic terminology - index of names

 
     
  Some species of climbing plants develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place.  
     
Climbing plants, like the poison ivy (Toxicodendron radicans), Boston ivy (Parthenocissus tricuspidata), and trumpet creeper (Campsis radicans),  develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place. Usually the Holdfast roots die at the end of the first season, but in some species they are perennial. In the tropics some of the large climbing plants have hold-fast roots by which they attach themselves, and long, cord-like roots that extend downward through the air and may lengthen and branch for several years until they strike the soil and become absorbent roots.

Major references and further lectures:
1) E. N. Transeau “General Botany” Discovery Publishing House, 1994
   

 

 

 

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