Question

Fibre, the longest cell belongs to which tissue?
A.Parenchyma
B.Collenchyma
C.Sclerenchyma
D.Aerenchyma

Answer 1

Hint: Fibres are elongated cells having long tapering ends. There ends interlock to form structures that provide support to the plant. The fibres usually occur in bundles. These can be found in any plant part whether it is leaves, stem, roots, seed, etc. Fibres are one of the main two types of ground tissue that majorly consists of dead supporting cells.

Complete answer:Let us understand each of the given types of tissues to know which tissue forms fibre.
Parenchyma is one of the three main ground tissues in plants. They are simple permanent tissues. The vascular tissues like xylem and phloem are embedded in the parenchyma. The parenchyma tissue itself is non-vascular and is made of living cells that are mostly undifferentiated. These undifferentiated cells are modified based on the function they need to perform. Parenchyma cells divide actively even at maturity.
Aerenchyma is a type of parenchyma. The cells of aerenchyma consist of very large intercellular spaces. Aerenchyma is present in aquatic plants where they provide buoyancy to them.
Collenchyma is the second type of ground tissue. Collenchyma cells are thin and have thin primary cell walls with some areas having secondary thickening. They function to provide extra mechanical and structural support to the plant. They are particularly present in regions of new growth.
Sclerenchyma is the third type of ground tissue. These are the main structural support providers of the plant. The cells of the sclerenchyma consist of thick lignified secondary cell walls. The cells die at maturity. It is majorly present in two forms namely sclereids and fibres. The fibres are long cells having tapering ends. The ends of these elongated cells intercross to provide maximum support to the plant.
Thus, fibres that are the longest cells belong to the sclerenchyma tissue of plants. So, option C is correct.

Note:The fibres can be found in every plant part. Fibres like seed hairs, bast fibres, leaf fibres, etc are used largely in industries as raw materials. They are used to manufacture textiles and other woven goods. Fibres can be found in leaves, stems, roots, seeds, etc.