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Chapter: Biology: Division of Labour In Multicellular Plants : Tissue and Tissue System

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Laticiferous tissues and Glandular tissues

Glandular tissue: Honey, Enzymes, Gums, Resins, Oils etc. areusually found in the glandular tissues :

Laticiferous tissues and Glandular tissues.

 

Laticiferous tissue: Latex is a white, yellow or colourless liquidCarbohydrates, protein, gums, and fats etc. are mixed in Latex, Latex is found in various plants like;- 

Musa (KALA) Ficus (BOT), Hevea (RUBBER), Papiver (OPIUM), Calotropis (AKONDO), Alstonia (CHHATIM), Argement (SHIALKATA).


Glandular tissue: Honey, Enzymes, Gums, Resins, Oils etc. areusually found in the glandular tissues :





Tissue System

When one or more kinds of tissues are united and together perform a similar function, then it is known as tissue system. They are classified into three types namely: 

i) Epidermal Tissue System, ii) Ground Tissue System and iii) Vascular Tissue System.

 

i) Epidermal Tissue System: - This tissue system makes the outer cover ofplant organs like, roots stems, branches, leaves, fruits. etc. Typically it consists of a closely arranged single layer of parenchymatous cells. There may have unicellular or multicellular hairs.

Functions: To give protection to the internal portion of the plant organ.

 

ii) Ground Tissue System :

 

Theses are the main bulk of tissues of roots and stems. The ground tissue is differentiated into outer cortical region and inner medulla or pith region. In dicot stem the cortical region is ususlly subdivided into three zones namely:-

 

(a)   Hypodermis,         (b)      General Cortex  and     (c)         Endodermis,

 

Medulla and Medullary Raysencircled by, the Pericycle form the central Pith.

 

Functions : Functions of this tissuesystem are to give mechanical stregth to the stem and to store food materials.

 

iii) Vascular Tissue System:-

Vascular tissue system comprises of two complex tixssue, namely;

 

Xylem and phloem, These tissuesare embedded in the ground tissues. In dicotyledonous stems xylem and phloem lie side by side on the same radius and between them there is akind of Meristamatic tissue named Cambium. Phloem tissue lies towards the periphery and xylem toward center of the stem.

Arrangement of different tissue system of a dicot stem is shown In longitudinal (I.S.) and transverse section (T.S) [Gig: -4.8 & 4.9]


Function

 

Conduction of water and dissolved food materials.

Conduction of prepared food.

Give mechanical strength to the stem, and

Storage of food where necessary




 

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