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Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 7

A natural fibre obtained by boiling cocoons is called ______. - Science

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Question

A natural fibre obtained by boiling cocoons is called ______.

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Solution

A natural fibre obtained by boiling cocoons is called silk.

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Animal Fibre: Silk
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Chapter 3: Polymer Chemistry - Evaluation [Page 62]

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Samacheer Kalvi Science - Term 3 [English] Class 7 TN Board
Chapter 3 Polymer Chemistry
Evaluation | Q II. 5. | Page 62

RELATED QUESTIONS

Out of the following, which are the two terms related to silk production?

Sericulture, floriculture, moriculture, apiculture and silviculture

Hints:

(1) Silk production involves cultivation of mulberry leaves and rearing silkworms.

(2) Scientific name of mulberry is Morus alba.


Match the words of Column I with those given in Column II:

Column I Column II
Scouring Yields silk fibres
Mulberry leaves Wool yielding animal
Yak Food of silk worm
Cocoon Reeling
  Cleaning sheared skin

Peace silk was produced in the year ______.


Define – Sericulture


Who invented the Ahimsa silk?


Write about any three uses of silk.


Write about Ahimsa Silk.


Which of the following is not a type of silk?


The general process that takes place at a sheep shearing shed is


State whether the following statements are True or False. If false, correct them.

The rearing of silkworms for obtaining silk is called silviculture.


Some words related to silk are jumbled up. Write them in their correct form.

TURECULRISE


Some words related to silk are jumbled up. Write them in their correct form.

WILSMORK


Some words related to silk are jumbled up. Write them in their correct form.

BELMURRY


Steps for the production of silk are given below in a jumbled order. Arrange them in their proper sequence.

  1. Eggs are warmed to a suitable temperature for the larvae to hatch from eggs.
  2. Fibres are taken out from the cocoon.
  3. After 25 to 30 days, the caterpillars stop eating and start spinning cocoons.
  4. The larvae/caterpillars or silkworms are kept in clean trays along with freshly chopped mulberry leaves.
  5. Female silk moths lay eggs.
  6. Cocoons are kept under the sun or boiled in water.

Which of the following fibers is considered the strongest natural fiber?


______ are boiled to get the silk.


The production of silk is called ______.


The silk moth feed on ______.


The larva of a silkworm is called ______.


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