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

______ is a non-biodegradable material - Science

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Question

______ is a non-biodegradable material

Options

  • Paper

  • A plastic bottle

  • Cotton cloth

  • Wool

MCQ
Fill in the Blanks

Solution

Wool is a non-biodegradable material

shaalaa.com
Animal Fibres: Wool
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Chapter 3: Polymer Chemistry - Evaluation [Page 62]

APPEARS IN

Samacheer Kalvi Science - Term 3 [English] Class 7 TN Board
Chapter 3 Polymer Chemistry
Evaluation | Q I. 6. | Page 62

RELATED QUESTIONS

You must be familiar with the given nursery rhymes

Baa baa black sheep, have you any wool.

Answer the following:

Which parts of the black sheep have wool?


You must be familiar with the following nursery rhymes:

Mary had a little lamb, whose fleece was white as snow

Answer the following:

What is meant by the white fleece of the lamb?


What is meant by term Rearing?


What is meant by term Shearing ?


What is meant by term Sericulture?


Given below is a sequence of steps in the processing of wool. Which are the missing steps? Add them

Shearing, __________, sorting, ______________________________


Given below is a crossword puzzle based on this lesson. Use hints to fill in the blank spaces with letters that complete the words.

Down

(D) 1: Thorough washing

2 : Animal fibre

3 : Long thread like structure

Across

(A) 1 : Keeps warm

2 : Its leaves are eaten by silkworms

3 : Hatches from egg of moth


What are the characteristics of wool? Give any three.


What are the major steps involved in this wool factory.


Write the uses of the wool.


Assertion: Wool is the fibre derived from the fur of animals.

Reason: Animals like goat, Yak, Alpaca and rabbit yields wool.


Paheli wanted to buy a gift made of animal fibre obtained without killing the animal. Which of the following would be the right gift for her to buy?


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

In India, camels and goats are generally reared for obtaining wool.


How does the hair of certain animals help in keeping their bodies warm?


Various steps involved to obtain wool from fleece are given here.

  1. Picking out the burrs
  2. Dyeing in various colours
  3. Shearing
  4. Scouring
  5. Sorting

Write the above steps in the correct sequence in which they are carried out.


Figure 3.1 shows three rings of circles with letters in them. Some of these letters in each ring can form the name of one wool yielding animal. Find the names of these animals.


A wholesale woollen fibre dealer gets the woollen fibre of different textures sorted for various purposes. Match the items in Column I with the woollen fibre in Column II.

Column I Column II
(a) Pashmina shawl (i) Camel wool
(b) Woollen carpet (ii) Angora wool
(c) Baby blanket (iii) Kashmir goat
(d)  Woollen sweater (iv)  Sheep wool

On burning wool, why we get the small of burning of hair?


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