Root modification

Root modification with examples?

Root modification :
  • In some plants root change they shape and structure to perform functions. Other than absorption and conduction of water and minerals is called Root modification. 
  • The radicle of embro elongates leads to formation of primary root which grows into the soil is called Root. 
  • In angiosperms, two types of root system are present namely. 
  • 1.tap root system 2.fiborous root system. 
1.Tap root system:
  • The primary root grows into soil called Tap root. 
  • Which produce lateral roots and roots lets constitutes tap root system. 
  • It is seen in Dicotyle-donous-plant.
2.Fibrous root system:
  • The primary root is a short lived and replaced by a large number of roots. 
  • Which  originate from base of the stem constiuent Fibrous root system.
  • It is seen in Monocotyledonous plants. 
Root modification are different types. 
They are:
  1. Storage roots:
  • In carrot, turnip(tap roots). 


  • Sweet potato(adventitious roots). 
  • Asparagus (Fibrous root). 
  • These plants are become swollen because due to storage of food materials called storage roots. 
2.Prop roots are Pillar roots:

  • In Banyan tree, Roots arise from the branches grow into the soil, become pillar like and give additional support called Prop roots or Pillar roots. 
3.Stilt roots:



  • In maize, sugarcane, roots arise from lower nodes of the stem, give additional support called Still roots
4.Pneumatophores:


  • In Mangroves like Rizophora and Avicennia, many roots come out of the ground and grow vertically upward, help in called Pnuematophores.
5.Velamen roots:
In Epiphytes like vanda, special avdentitious roots arise, help in absorption of moisture from atmosphere. 

Comments

Post a Comment

Popular posts from this blog

Sailent features and importance of chrysophytes.

Image
Silent features and importance of chrysophytes? Ans: Chrsophytes i doatoms and golden algae.  They are found in fresh water as well as in marine water. Most of them are photosynthetic.  In diatoms the cell wall form two thin overlapping shells, epithet over hypothetical which fit together as soap box.  The walls are embedded with silicon and thus the walls are indestructible.  Diatoms leave large amount of cell wall deposits in there habitat, this accumulation referred as diatomaceous earth or kieselghur.  They reproduce a sex ally by vinay fusion and sex ally by games.  Important : *The diatomaceous soil is used in polising,filtration of oils and syrup. *Diatoms are the chief`producers'in the oceans. If any doubts please comment  Thank you.....  Have a nice day
Read more

What is dinoflagellates?

Image
Brief account of dinoflagellates? Ans: Dinoflagellates are mostly marine and photosynthetic.  The cell wall has stiff cellulite plates on the outer surface.  They have two flagella and produce spinning movements. So protests are called whirling wipe.  The nucleus has condensed chromosomes, which are without histones.  Some dinoflagellates like noctiluca show bioluminescence.  Red dinoflagellates like Gonyaulax undergo rapid multiplication and make the sea appear red[Resides in Mediterraneliansea]. Toxins produced by them may kill fishes.
Read more

Characterstic features ofEuglenoids.

Image
What are the characterstic features of euglenoid? Ans: Most of the euglenoids are fresh water organises found in stagnantwater.  They have a protien rich layer called pellicle which make body flexible. They have two flagella, a short and a long one.  The anterior part of the cell bears an invagination consisting of cytostome, cytopharynx and reservoir. Eye spot or photosensitive stigma is present in the reservoir.  They behave as heterotrophs when deprived in sunlight.  The reproduction is by longitudnal vinay fussing. For more information please comment Thank you.......  Have a nice day
Read more