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

HOTS Silk fiber is used to manufacture parachute. Why? - Science

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Question

HOTS

Silk fiber is used to manufacture parachute. Why?

Answer in Brief

Solution

  1. Silk is the strongest natural fibre.
  2. It is thin light in weight, strong.
  3. It is easly to peak and unfold.
  4. It is also fire resistant.
  5. It is dries quickly.
  6. It is also resistant to abrasion and chemicals.
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Animal Fibre: Silk
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Chapter 5: Animals in Daily Life - Evaluation [Page 91]

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Samacheer Kalvi Science - Term 3 [English] Class 7 TN Board
Chapter 5 Animals in Daily Life
Evaluation | Q IX. 1. | Page 91

RELATED QUESTIONS

The silkworm is (a) a caterpillar, (b) a larva. Choose the correct option


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

A natural fibre obtained by boiling cocoons is called ______.


The cultivation and production of silk is known as ______.


Who invented the Ahimsa silk?


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Write about Ahimsa Silk.


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


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

Silkworms are caterpillars of silk moths.


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

BELMURRY


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

RINGLEE


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.

Paheli went to the market to buy sarees for her mother. She took out a thread from the edge of the two sarees shown by the shopkeeper and burnt them. One thread burnt with the smell of burning hair and the other burnt with the smell of burning paper. Which thread is from a pure cotton saree and which one from a pure silk saree? Give a reason for your answer.


Describe the life history of the silk moth with the help of figures from various stages.


The silk moth feed on ______.


The larva of a silkworm is called ______.


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