Question

Define and explain the following:
(i) parenchyma
(ii) collenchyma
(iii) scelerenchyma

pls give the answer as per CBSE class 9 syllabus.

Answer 1

"PARENCHYMA" : The permanent tissue having dense cytoplasm , oval and isodimatic shape and elongated .
Function :-
• Acts as a "Packing Tissue".
• Storage
Location :-
• Leaves
• Fruit Pulps
• Xylem and Phloem
"COLLENCHYMA" : The permanent tissue having elongated cells .
Function :-
• Provide rigidity with flexibility to the branch and stem .
Location :- Sides of stem and branch petiole of leaves .
"SCLERNCHYMA" : The permanent tissue having dead cells without protoplasm and Very thick cell wall due to deposition of lignin .
Function :-
• Provides mechanical support
• Stores waste products
Location :-
• Leaf Veins
• Hard covering of seeds
• Xylem and Phloem
Please mark me as BRAINLIEST .

Answer 2

$parenchyma -$


Parenchyma, a form of bulk of the plant body. parenchyma cells are living and purchase the power of division. The cell wall is thin and enclosed dense cytoplasm which contains a small nucleus and surrounds a large central vacuole. common in other words parenchyma cells have living Protoplasm.

FUNCTION–

♦ parenchyma serves as a packing tissue to fill the space between other tissues and maintain the shape and fireman's of the plant due to its turgid cell.
♦ the main function of parenchyma is to store and assimilate food. parenchyma serves as food storage tissue.
♦ transport of materials occurs through self or Cell walls of parenchyma cells.
♦ parenchyma cells are metabolically active, there intercellular spaces allow gases exchange.


$collenchyma -$

collenchyma tissue also consist of living cells. it source many features of parenchyma, but is characterized by the deposition of extracellular at the corner of the cells. In collenchyma, intercellular spaces are generally absent.
collenchyma cells are elongated in shape. they often contain a few chloroplasts.

FUNCTION–

♦Collenchyma is a mechanical tissue in young dicotylendonous stamps and provides mechanical support and elasticity.
♦ then column, provides tensile strength with flexibility to those organs in which it is found.
♦it allows easy Bending in various parts of plants without actually breaking it.
♦ when cells of collenchyma contain chloroplast they manufacture sugar and starch.


$sclerenchyma -$


sclerenchyma cells are dead cells and they are devoid of Protoplasm. the cell walls of sclerenchyma are greatly thickened of Lignin. such cell-wall are called lignified.
cells of sclerenchyma are of two types:
fibres and sclereids.
FIBRES–
fibres consists of very long narrow thick and lignified cells.
SCLEREIDS–
sclereids also called grid cell or stone cells regular shaped.

FUNCTION—

♦the sclerenchyma is mainly mechanical and protective in function.
♦ it gives strength and rigidity flexibility and elasticity to the plant body and does enable it to withstand various stands.