Question

Jute is obtained from
A) Leaves of Linum sp.
B) Secondary phloem of stem Corchorus sp.
C) Secondary phloem of stem Linum sp.
D) Leaves of Corchorus sp.

Answer 1

Hint: Jute is a long, delicate, glossy bast fiber that can be spun into coarse, solid strings and threads. It is produced primarily from plants in the genus Corchorus, which was once classified with the family Tiliaceae. The primary source of the fiber is Corchorus olitorius, however it is viewed as sub-par compared to Corchorus capsularis.

Complete answer:
Jute is one of the most affordable natural fibers and is second only to cotton in amount produced and the variety of uses of a vegetable Fibre. Jute strands are made basically out of the plant materials cellulose and lignin. It falls into the bast fiber class (fiber gathered from the past or skin of the plant or secondary phloem) alongside kenaf, industrial hemp, flax (linen), ramie, and so on.
The jute fiber originates from the stem and ribbon (external skin) of the jute plant. The filaments are first separated by retting. The retting cycle consists of packaging jute stems together and immersing them in moderate running water. There are two kinds of retting: stem and ribbon. After the resting cycle, stripping starts. In the stripping cycle, non-fibrous materials are scratched off, at that point the laborers dig in and grab the fibres from inside the jute stem.

Therefore, the correct option is B, i.e. Secondary phloem of stem ‘Corchorus sp’

Note:The jute plant is generally harvested at flowering stage. The stems of harvested plants are packaged and submerged in water for 10 to 15 days. The stems decay (the cycle is called rotting) and filaments are then separated by hand. These strands are changed over into yarns to make the jute fabric.