ICSE Class 7 Answered

POINTS FOR COMPARISON

PARENCHYMA

COLLENCHYMA

SCLERENCHYMA

Type of cells

Living plant cells which originate from ground and protoderm meristem.

Living plant cells which originate from the pro-cambium.

Dead plant cells which originate from ground meristem and protoderm procambium.

Location

Present in every soft part of the plant.

Found in leaves, stems, and petioles.

Found in mature parts of the plants or trees.

Nature of cells

Unspecialized and living cells.

Specialized cells and living cells. 

Specialized, matured and dead cells.

Cell Shape 

Generally isodiametric.

Elongated

Sclereids, elongated and fibre shape.

Cell wall

Thin cell wall present made up of cellulose.

Uneven cell wall made up of pectin and hemicellulose.

Hard and thick cell wall made up of lignin.

Intercellular space between the cells

Present

Less space present

Absent, so cells are tightly packed.

Function

Help in storage of foods, in gaseous exchange, and in photosynthesis.

Provide mechanical support and elasticity to the plant.

Provide mechanical support to the plant, help in transportation of water and nutrients to the plants.