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Structure & Classification

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”It is not so much that the cells make the plant;  it

is rather that the plant makes the cells"

Heinrich Anton de Bary

...
Learning objectives: 

I What are vascular bundles (VB)? 

I How Vascular bundles originate? 

I Different types ofvascula...
VASCULAR BUNDLES

 

What are vascular bundles?  What are its components? 

I Vascular bundles are components of Vascular ...
VASCULAR BUNDLES  

7'  [A51
What are vascular bundles?  What are its components? 
Vascular bundles consists of TWO main p...
VASCULAR BUNDLES

 

How vascular bundles originate in plan ts? 

E The elements of xylem and phloem are always organized ...
VASCULAR BUNDLES  g j
E Z ‘(EASY ‘ 
Different types of vascular bundles: 

1 Vascular bundles are classified based MANY cr...
VASCULAR BUNDLES

 

Different Types of Vascular Bundles

Open Closed
 Vascular Bundle (VB) 

Tl

Radial Conjoint I
Collat...
VASCULAR BUNDLES

 

Open & Closed Vascular Bundles: 
I A classification of VB based on presence of Cambium

I Cambium:  a...
VASCULAR BUNDLES

 

Open & Closed Vascular Bundles: 

Phloem
(2).  Closed vascular bundles: 

I Cambium absent within vas...
VASCULAR BUNDLES

 

Radial Vascular bundle

I Based on the arrangement of VB components
I Xylem and phloem are arranged s...
VASCULAR BUNDLES "%   I r

  

IASV BIOLOGY CLASS

Conjoint vascular bundles
I Xylem and phloem are arranged together
I Xy...
VASCULAR BUNDLES

(1).  Collateral vascular bundles: 
I A type of conjoint VB
I Phloem located ONLY OUTSIDE of the xylem

...
VASCULAR BUNDLES

  

, _
‘n

EASY IIOLOCY (MM

(2).  Bi-collateral Vascular Bundles

Phloem
I A type of conjoint VB
I Phl...
VASCULAR BUNDLES

(3).  Concentric Vascular Bundles: 
A type of conjoint vascular bundle
One VB element completely surroun...
VASCULAR BUNDLES

(3).  Concentric Vascular Bundles: 

A).  Amphicribal: 

  

F A type of concentric vascular bundle

 

...
43..  V‘
'7' ,  1:: 
' K. /PIASY H

VASCULAR BUNDLES

Model questions: 

What is meant by collateral vascular bundle? 

Wh...
VASCULAR BUNDLES

Reference: 
Prakash,  E.  I.  I. , A Text Book of PlantAnatomy,  Ed.  2, 2000,

Emkay Publications, Delh...
Formore L'nfb1maz‘1'on,  please log on to:  W" W w. easybiolo gyclass. com

For Video tutorials please subscribe the You T...
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Vascular Bundles Structure and Classification (Different Types of Vascular Bundles): Plant Anatomy by Easybiologyclass

Structure and Classification of Vascular Bundles in Plants. What are the components of vascular bundles? How vascular bundles originate in plants? What is meant by open and closed vascular bundles? Differentiate conjoint and radial vascular bundles. Differentiate collateral and bicollateral vascular bundles. What are concentric vascular bundles? Difference between amphicribal and amphivasal vascular bundles.

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Vascular Bundles Structure and Classification (Different Types of Vascular Bundles): Plant Anatomy by Easybiologyclass

  1. 1. .: _L ; ,f , <w‘, , 2-. — , 1«i» - ‘ wiscumla BUN LES Structure & Classification «————*——-————-——_——; —+—'—~—’-V-—'—»-— ~———. — ——~= =-. '——————_? ’~ '— *—- —u , , . —= ——— *—. j—-’ e—mail: easybiologyclass@gmail. com " mail@easybiologyclass. com www. easybiologyclass. c0m '
  2. 2. ”It is not so much that the cells make the plant; it is rather that the plant makes the cells" Heinrich Anton de Bary www. easybiologyclass. com ls)
  3. 3. Learning objectives: I What are vascular bundles (VB)? I How Vascular bundles originate? I Different types ofvascular bundles in plants: I Conjoint VB I Collateral VB I Bi-collateral VB I Open and Closed VB I Radial VB I Concentric VB (amphicribral and amphivasal) www. easybiologyclass. com
  4. 4. VASCULAR BUNDLES What are vascular bundles? What are its components? I Vascular bundles are components of Vascular Tissue System I Also called as ‘fascicle' 1 Part of TRANSPORT system in plants _, j *4 » 3' l 3' g Bundle I One of the PRIMARY tissue system in plants I It is a COMPLEX tissue system in plants tesmaa saw 4 - . On. dfiiof 3 Fpeflole lg‘: -is2ee. ~za. ena; sa'sn*: §su ' I Complex tissue = composed ofMORE THAN ONE TYPE OF CELLS www. easybiologyclasscom 4
  5. 5. VASCULAR BUNDLES 7' [A51 What are vascular bundles? What are its components? Vascular bundles consists of TWO main parts I ‘C ”/ ‘x. _ _ I‘ I‘ ‘ _ 1. Xylem: water conducting tissue - ’ l 1 . " 2. Phloem: food conductingtissue : cg ' r j . , -vw. :mhinl ~§l€%n , Xylem and phloem are complex tissues Typical Vascular gumue Components of xylem: Tracheids, Vessels, Xylem fibres & Xylem parenchyma Components of phloem: Sieve cells, Sieve tube elements, companion cells, Phloem parenchyma, Phloem fibres (bast fibres) www. easybiologyclass. com Ul
  6. 6. VASCULAR BUNDLES How vascular bundles originate in plan ts? E The elements of xylem and phloem are always organized in groups called VASCULAR BUNDLES W" H " W Vascularflundle X. /I’ _/ ' bundles www. easybiologyclass. com 6
  7. 7. VASCULAR BUNDLES g j E Z ‘(EASY ‘ Different types of vascular bundles: 1 Vascular bundles are classified based MANY criterions 1. Based on presence of Cambium/ secondary growth > Open VB & Closed VB 2. Based on arrangement in the plant body > Radial & Conjoint 3. Based on arrangement of individual VB components > Collateral, Bi-collateral & Concentric (amphicribal & amphivasal) www. ea. sybiologyclass. com 7
  8. 8. VASCULAR BUNDLES Different Types of Vascular Bundles Open Closed Vascular Bundle (VB) Tl Radial Conjoint I Collateral I Bi-collateral Concentric Amphicribal Amphivasal www. easybiologyclass. com
  9. 9. VASCULAR BUNDLES Open & Closed Vascular Bundles: I A classification of VB based on presence of Cambium I Cambium: a meristematic tissue responsible for secondary growth Phloem (1). Open vascular bundle Cambium > Cambium present between xylem & phloem Xylem Secondary growth present > Open Vascular Bundle_ ‘ > Characteristic of dicotyledons (dicots) > Open for secondary growth V’ Cambium present between xylem & phloem is called FASCICULAR CAMBIUM 7 _ ~ » Open VascularBune(Dicot'Stem) @
  10. 10. VASCULAR BUNDLES Open & Closed Vascular Bundles: Phloem (2). Closed vascular bundles: I Cambium absent within vascular bundle x"'°"' I Secondary growth absent Closed Vascular Bundle . . um I Characteristic of monocotyledons [monocots) I Closed for secondary growth I Fascicular Cambium absent Closed Vascular Bundle (Monocot Stem) E
  11. 11. VASCULAR BUNDLES Radial Vascular bundle I Based on the arrangement of VB components I Xylem and phloem are arranged separately I Arranged alternatively in different radii I Radial vascular bundles are found in ROOTS Xylem Phloem Radial Vascular Bundles fl
  12. 12. VASCULAR BUNDLES "% I r IASV BIOLOGY CLASS Conjoint vascular bundles I Xylem and phloem are arranged together I Xylem and phloem in same radius I Conjoint VB are found in STEM and LEAVES I Three types: 1. COLLATERAL 2. BI-COLLATERAL 3. CONCENTRIC
  13. 13. VASCULAR BUNDLES (1). Collateral vascular bundles: I A type of conjoint VB I Phloem located ONLY OUTSIDE of the xylem I Xylem towards interior, phloem towards exterior ‘~'i~ . 45+ Collateral Vascular Bundles I Most common type I Collateral VB may be Open or Closed Phloem Phloem Cambium Cambium Xylem Xylem Open Vascular Bundle Open Vascular Bundle Collateral Vascular Bundles Q
  14. 14. VASCULAR BUNDLES , _ ‘n EASY IIOLOCY (MM (2). Bi-collateral Vascular Bundles Phloem I A type of conjoint VB I Phloem present in two groups Xylem I One outside the xylem, other inside the xylem Phloem I (xylem in the middle, phloem both sides) I Characteristic of some Angiosperms Bi-collateral vascular Bundle I Example: members of Cucurbitaceae (Cephalandra, C ucurbita) I Bi-collateral vascular bundles are always OPEN
  15. 15. VASCULAR BUNDLES (3). Concentric Vascular Bundles: A type of conjoint vascular bundle One VB element completely surrounds the other Either phloem surrounds xylem or xylem surrounds the phloem Two types: a) Amphicribal: b) Amphivasal: www. ea. sybiologyclass. com UI
  16. 16. VASCULAR BUNDLES (3). Concentric Vascular Bundles: A). Amphicribal: F A type of concentric vascular bundle VA. “~l n Xylem lies at the centre, surrounded by a ring of phloem A, ,,, m'/ .1,a1 r“. Example: Meristeles of ferns, small vascular traces of flowers, fruits and ovules B). Amphivasal: r" A type of concentric vascular bundle F Phloem lies at the centre, surrounded by a ring of xylem Amphivasal F‘. Example: Dracaena stem, Rumex, Begonia www. easybiologyclass. com 1 6
  17. 17. 43.. V‘ '7' , 1:: ' K. /PIASY H VASCULAR BUNDLES Model questions: What is meant by collateral vascular bundle? What is meant by bi-collateral vascular bundle? Differentiate open and closed vascular bundles? What is meant by concentric vascular bundles? What is meant by radial vascular bundles? Describe bi-collateral vascular bundle. Give example. What is amphicribal vascular bundle? Give one example. What is amphivasal vascular bundle? Give one example. . ‘°. °°. l. °‘. °": F‘S'°E"! " What are the components of vascular bundle? 10. How vascular bundles are classified based on secondary growth? 11. Write a short note on concentric vascular bundles with examples. 12. Differentiate collateral and bi-collateral vascular bundles. www. easybiologyclass. com 17
  18. 18. VASCULAR BUNDLES Reference: Prakash, E. I. I. , A Text Book of PlantAnatomy, Ed. 2, 2000, Emkay Publications, Delhi. wwweasybiologyclass. com 18
  19. 19. Formore L'nfb1maz‘1'on, please log on to: W" W w. easybiolo gyclass. com For Video tutorials please subscribe the You Tube clzamzel: You- easybiologyclass ‘llianléfl/ ou. . . E-mail us @: easybiologyclass@gmail. com O. mail@easybiologyclass. com I. - visit: www. easybiologyclass. com

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