Question

The flax fibre, the best fibre or phloem fibres are obtained from
A) Cannabis sativa
B)Crotalaria juncea
C) Cocos nucifera
D) Linum usitatissimum

Answer 1

Hint: The best fibre is obtained from the phloem or inner bark of the plant. It is obtained from the stem of the dicotyledonous plants. The main function of this is to provide support and strength to the stem.

Complete Solution:
Flax is collected from the inner bark of the stem of a plant which grows in the temperate and subtropical regions. It is mainly composed of cellulose. The flax is commonly called linseed. It belongs to the genus Linum and family Linaceae. The botanical name of the flax plant is Linum usitatissimum. The flax is one of the very important members of this family. It is used both as an oil seed and also fibre is obtained from it.
The flax fibres are 1-10 cm long, soft and lustrous and give the appearance of the golden hair. It is stronger than cotton fibre but is less elastic. It is used for making linen fabric, lace, sheets etc.
Cannabis sativa- It is an annual herb which is used for industrial fibre, as medicine.
Crotalaria juncea- It is known as hemp. It is edible.
Cocos nucifera is a coconut plant. The fibre obtained is used for making ropes, rugs.

So the correct answer is option “D”.

Note:
Flax seed is an edible seed which is good for controlling high sugar, blood pressure, swelling and inflammation of the kidney. It is rich in good cholesterol and serves as an important source of dietary fibre.