Question

The longest cell in plant kingdom is
A)Sieve tube
B)Vessel
C)Sclerenchyma fibre
D)Tracheid

Answer 1

Hint: Plantae is the kingdom of plants that includes all the plants on the planet. They are eukaryotes that are multicellular. Characteristically, they contain a rigid structure known as the cell wall that protects the cell membrane.

Complete answer:
The longest cell in the plant is Ramie's fibre.

Ramie is a flowering plant native to eastern Asia in the urticaceae family of nettles.It is a perennial herb that grows to a height of 1-2.5 metres (3 ft 3 in-8 ft 2 in the leaves are heart-shaped., 7-15 centimetres (2.8-5.9 in) long and 6-12 centimetres (2.4-4.7 in) wide and white with thick tiny hairs on the underside, giving it a silvery appearance; the hairs do not sting unlike stinging nettles.

Often called Chinese plant or white ramie, the real ramie or China grass. Sclerenchyma fibres are the longest cell in the plant kingdom as Ramine fibre of Boehmeria nivea (550 mm).

Sclerenchyma supports tissue in plants consisting of each of the various forms of hard woody cells.Mature cells of sclerenchyma are typically dead cells that have lignin-containing secondary walls heavily thickened. The cells are rigid and non-stretchable and in nongrowing areas are usually found in plant bodies such as bark or mature stems.

Sclerenchyma is one of three types of soil or essential tissue in plants. Parenchyma (living thin-walled tissue) and collenchyma are the other two types (living support tissue with irregular walls).In several different shapes and sizes, Sclerenchyma cells occur, but fibres and sclereids occur in two key forms.

Hence, the correct answer is option (C)

Note: Fibers are largely elongated cells whose long, tapering ends interlock, providing a plant with full support. They sometimes occur in bundles or strands and can be found almost anywhere in the body of the plant, including the stem, roots, and leaf vascular bundles.s. Many of these fibres, including seed hair, leaf fibres and bast fibres, are important sources of raw material for textiles and other woven items.