Discussion
Nodes are seen in the following fibre :
Answer: D
Nodes are seen in the linen fibre, option D. Linen is made from flax, a bast fibre whose long cells show cross markings called nodes, or joints, along the length, which help to identify it under the microscope. Cotton (A) has a flat twisted ribbon form, wool (B) has surface scales, and silk (C) is a smooth structureless fibre, and none of them has nodes. Wool is recognised by the overlapping scales on its surface, and cotton by the flat twisted ribbon with a central lumen.
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