Question

Enlist the features of sclerenchyma

Answer 1

they are thick and strong cells which provide support to the plant body and they do not take part in photosynthesis .once they r dead they simply maintains the structure of plant body eg:sclereids and fibres

Answer 2

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➧ Types 0f Simple Permanent Tissues are:-▬▬▬▬▬▬▬▬▬▬▬▬▬⤵

❶❭ Parenchyma:-┅┅┉┅┅┉┅┅┉┅┅┉┅┅┉┅☟

● The unspecialised living plant tissue formed of thin walled rounded cell.

● This cell are isodiametric & least specialised.

● It is considered at the fundamental tissue or ground tissue.

➧ It's Characteristics are:-━━━━━━━━━━━━━━━━━━☟

❱ Cells are living cells with thin cell wall of cellulose.

❱ They are rounded, oval or polygonal in shape with intercellular spaces.

❱ Cytoplasm is dense with one large or more than one small vehicles.

➧ It's Functions are:-━━━━━━━━━━━━━━━━━━☟

❱ It form the ground tissue or packing tissue in plants.

❱ It provide rigidity to the plant by keeping cell rigid.

❱ It's cell store food.

❱ It helps in wound healing, regeneration & grafting.

❱ It cells are allow to exchange of respiratory gases.

❷❭ Collenchyma:- ┅┅┉┅┅┉┅┅┉┅┅┉┅┅┉┅☟

● It is found in steam leaf, leaf stalk & leave midribs of dicot herbaceous plant.

● It forms a layer below the epidermis called hypodermis.

● It is absent in monocot stem.

➧ It's Characteristics are:-━━━━━━━━━━━━━━━━━━☟

❱ Cells are living unfairly elongated.

❱ They appear polygonal, 0val or circular in cross-section.

❱ Cells surrounded by thik primary cell wall alone.

❱ The cell wall is thickened along the corner due to the deposition of cellulose & pectin.

❱ The cytoplasm has a large central vacuole.

➧ It's Functions are:-━━━━━━━━━━━━━━━━━━☟

❱ It provide mechanical support to the delicate developing organs of herbaceous Dicot stem.

❱ It cells combine both tensile strength & flexibility.

❱ It cells with chloroplast carrying out photosynthesis.

❱ This cell also store food & allow growth & elongation of 0rgan.

❸❭ Scelerenchyma :- ┅┅┉┅┅┉┅┅┉┅┅┉┅┅┉┅☟

● It is a hard supporting tissue formed of long, narrow & pointed ends.

● It occurs in root stem, leaves & petiole.

● These cells are dead with thick lignified walls that gradually lose Protoplasm.

➧ It's Characteristics are:-━━━━━━━━━━━━━━━━━━☟

❱ These are dead cell without nucleus & cytoplasm.

❱ Their cell wall is formed of cellulose & hemi-cellulose.

❱ It is thickened due to the secondary the position of Lignin.

❱ Lignin act as a cement & hardens the cell wall.

❱ The lignified cell wall has pits.

➧ It's Functions are:-━━━━━━━━━━━━━━━━━━☟

❱ It provide most of the support in a plant.

❱ To compressive & tensile stresses in plants.

❱ It allows the organs to withstand bending, shearing & compression.

❱ It's cells provide protective, vascular & supportive functions.

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