Question

Cotton fibers mainly contain
A.Cellulose
B.Glycogen
C.Protein
D.lipid

Answer 1

Hint: Cotton consists of Epidermal trichomes of seeds of Gossypium herbaceous and many other species. Epidermal trichomes are hairy epidermal prolongations of seed coat cells. Chemical constituents in raw cotton: Cellulose- 90-94 %, Protein-1-3%, Pectic substances-0.9%, ash-1.2%, wax-0.6%, sugars-0.3% and traces of mineral matter and pigments is also present.

Complete answer:Natural fibers: Natural fibers are the hair like raw material directly obtained from plant, animal, or mineral source. Examples like cotton, jute from plants, and wool from sheep.
Synthetic fibers: These fibers are the one which is made by human in laboratories. Example: Polyester, Nylon Acrylic, etc.
Semi-Synthetic Fibres: Some semi-synthetic fibers are made using natural fibers as the starting material. Natural fibers are chemically processed and modified. Examples like Rayon and Artificial wool are included in this category.
Option -A-Cellulose: Cellulose is chiefly present in cotton fiber, about 90-94%. So this option holds good.
Option -B-Glycogen: If present, in a very minute concentration of glycogen is present.
Option -C-Protein: Protein constitutes only 2-3 % part of the cotton fiber.
Option -D-Lipid: Only a small amount of lipid is present in cotton fibers.
So, the correct answer is option A"Cellulose"

Note: Cotton fruit is known as "Capsule". Cotton belongs to the Malvaceae family. Ginning is the process by which cotton fibers are separated from the seeds. Raw cotton does not have absorbing property due to the presence of wax and fat in it whereas, in purified cotton, wax and fats are removed due to which it has the absorbing property. Entirely cellulose is present in purified cotton with 6-7% moisture.