A.Tick the correct answer:-

1.d 2.d 3.c 4.d 5.d

B.Differentiate between the following:-

1.Fibre means thread while Fabric is made up of interlaced fibre.

2.Wool is obtained from sheep and silk from silk moth.

3.Spinning means to make thread by twisting.

            Weaving means to make cloth with the help of loom.

4.Mulberry silk are natural silk,obtained from cocoon of silk moth, while non-mulberry silk are obtained from coal and petroleum.

5.Raw silk means green silk is obtained from cocoons. 

      Spun silk is the silk obtained by twisting silk fibre.

6. Retting is the process of an unwound silk filament from cocoons.

       Then, reeled filaments are spun into yarn, this is called throwing.  

C.Give one word answer for each of the following:-

1.Wool . 2.Fur .3. Pupa . 4. Raw silk.

D.Match column A with column B:-

1. Wool yielding animals.

2. Cover of pupa.

3. Type of silk.

4. Food.

5. Removal of fleece.

E.Give two example for each of the following:-

1. Silk, Nylon

2. Mohair (Angora goat),

Cashmere wool (Cashmere goat).

3. Muga silk, Spun silk.

F.Give reason for each of the following:-

1. To protect our body from the sun, rain etc and to give a good look.

2. Wool, inside contains air which is bad conductor of heat. Hence wool keep us warm during winter.

3. To kill the live moth.

G.write True or False:-

1. True 2. False 3. False 4. True 5. True

H.Circle the odd one:-

1. Wool 2. Deer 3. Caterpillar 4. Throwing

I.Fill in the blanks:-

1. Wool 2. Angora goat 3. India 4. Mulberry

J.Short-Answer Questions:-

1. Wool is a kind of fibre. Properties are:-

(a) It is a fluffy fibre.

(b) It keeps us warm.

2. Uses are:-

(a) As pull over.

(b) As sound absorbing material.

(c) Garment for fire fighters.

3. Wool workers are usually affected by sorter's disease.

4. Life cycle of silkmoth.

Egg----> lava-----> pupa----> developing moth--->adult.

5. China was the first country which started the production of silk but its Monopoly ended when silk road was opened. The credit for discovery of silk production goes to to Mrs Leizn, wife of Chinese emperor.

K.Long--Answer Questiuon:-

1. Wool is of various types. Some of them are:-

Alpaca wool is obtained from alpaca, an animal found mostly in South America. Its wool is soft, fine and warmer.

Angora wool is the wool produced from the town coat of the  Angora rabbit. This wool is known for its softness, thinness and fluffiness.

Bison fibre is obtained from Bison which is found in South America and Europe.

Cashmere wool is obtained from cashmere goat. This wool is expensive because of scarcity and quality.

Mohair wool is made from hair of angora goat, an animal found in Turkey. The wool is shiny and durable.

2. Sequence for wool production are:-

(a) Selective breeding.

(b) Rearing.

(c) Shearing.

(d) Scouring.

(e) Sorting.

(f) Removing Burrs.

(g) Dyeing.

(h) Carding.

(i) Roving.

(j) Spinning.

(k) Knitting.

(l) Crabbing.

3. Broadly, silk is is of four types:-

Mulberry silk- This silk feeds on leaves of mulberry plant and is produced in bulb for commercial scale. It is made from slkworm the Bombyx Mori.

Eri silk- This silkworms produced white or brick- red silk. Assam, Orissa, West Bengal and Bihar produced eri silk.

Tsar silk- This silk is produced by tsar silk worms which in India feed on terminalia leaves and in China and Japan feed on oak leaves.

Muga silk- Silk is found in Indian state of Assam and is one of the rarest type of silk. This silk is very strong and attractive.

4. Life cycle of silkmoth.

A Female silk moth lays 400-500 at a time.

After about two weeks the eggs hatch and lava came out. These are called caterpillars. This Caterpillar eat enormously for 5-6 weeks. They grow 10,000 times heavier than when hatched. During this period, they change their skin four times. This is called moulting.

 Now each Caterpillar starts secreting saliva from its salivary glands. This saliva is rich in proteins,sericin and  fibroin. This is liquid silk which solidifies on coming in contact with air within 2-3 days. In this way, the  Caterpillar spins its protective shell of cocoon around it. The larva inside the cocoon is called pupa.

       Now, cocoon are treated with hot steam to kill the pupa inside the cocoon. Then, this cocoons are unwound to obtain the silk filaments to obtained the silk filaments. This process is called reeling.

5. Health hazards in sericulture. India is the world's second largest producer of silk after China. However the workers of the industry often face the health hazards.

       The damp, poorly lit and poorly ventilated work condition lead to respiratory problems like asthma.

The dead worms are handle with bare hands, causing infection.

Severe headache and fever during all seasons are common among workers.

Loud noise of machines (spinning and winding machines) and loom leads to hearing impairment.