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Class 9 Exam  >  Class 9 Questions  >  Which one is not a plant fibre :-a)Coirb)Flax... Start Learning for Free
Which one is not a plant fibre :-
  • a)
    Coir
  • b)
    Flax
  • c)
    Hemp
  • d)
    Silk
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
Which one is not a plant fibre :-a)Coirb)Flaxc)Hempd)SilkCorrect answe...
Silk is not a plant fibre because plant fibre is the fibre we obtain from plants such as jute ,but silk is obtained from silk worm that is a kind of insect not a plant hence silk is not a plant fibre
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Community Answer
Which one is not a plant fibre :-a)Coirb)Flaxc)Hempd)SilkCorrect answe...
Most crop residue can be processed as cellulose. The cost of many of them isn't worth the effort unless there are some special circumstances such as being the only source within 800 miles.
Cotton, Jute, Hemp and Flax are the big ones as crops. On a smaller scale Nettles, Yucca, Luffa, and fibers taken form the wild make most of what comes off the farm.
Bamboo, Papyrus and wood products are managed as forests on much more complex continuous harvest management plan than annul corps.
Rice fiber for paper may be a specialty crop like some wheat is grown for thatched roofs in the UK but their considered by byproducts.
Silk is animal husbandry not a crop. The crop is mulberry leaves you feed silk worms.
Silk may soon be pharming operation. There are transgenetic goats that make spider silk protein in their milk. I don’t see why yeast couldn't make it as well. The protein may be too complex for yeast to metabolize. Rayon was one of our first efforts at man made cotton. I was failure. The microfiber that resulted form rayon, mixed with 40% cotton makes really nice shirt. None of the cotton fiber grown in the laboratory are good enough or cheap enough to bring to market but their better than Rayon was.
We are nearing a place that the tools in genetic research and computing have nearing the point in the economies of scale the limiting factor is ideas and effort not time, money or machinery. These will make the thing like cotton fibers grown in vats of yeast possible freeing up some of the best soil in the world to gtoe eomr
One must be clever but the world is theirs if they can visualize it. I feel that’s true in many fields today for those that have the courage to reach out and take the risks and reap the rewards and occasional failures. If you fail pick another one the looks good and hook your spurs in the cinch and ride it.
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