Fibre to Fabric quiz

Wool is obtained from the:

The removal of fleece from a sheep is called:

Silkworms feed on the leaves of:

Washing the sheared skin with hair to remove grease and dirt is called:

Pashmina shawls are made from the wool of:

Rearing silkworms to obtain silk is called:

The disease that can affect wool sorters is:

The stage of the silk moth that spins the cocoon is the:

Silk was first discovered in:

Wool keeps us warm because it:

Name two animals other than sheep that give wool. (2 marks)

What are burrs? Why are they removed? (2 marks)

Why are cocoons put in hot water or steamed? (2 marks)

Name the four stages in the life cycle of a silk moth. (2 marks)

What are the two types of fibres in the fleece of sheep? Which is used to make wool? (2 marks)

Why are sheep sheared in hot weather? (2 marks)

Name two varieties of silk other than mulberry silk. (2 marks)

Why do sheep in cold places have thick fleece? (2 marks)

What is reeling the silk? (2 marks)

What do sheep eat? Mention two things they are fed in winter. (2 marks)

A sheep gives about 2 kg of raw fleece per shearing, and about 60 percent of it is left as clean wool after scouring and sorting. How much clean wool is obtained from 50 sheep in one shearing? (3 marks)

A silk moth lays about 300 eggs. If 80 percent hatch and 90 percent of the caterpillars form cocoons, how many cocoons are formed? (3 marks)

About 3000 cocoons are needed for 1 kg of raw silk. How many cocoons are needed for 5 kg? If one silkworm eats 25 g of mulberry leaves in its life, how many kg of leaves do the silkworms for 1 kg of silk eat? (3 marks)

Arrange in order the life stages of the silk moth with their approximate duration: egg (about 10 days), larva (about 25 to 30 days), pupa (about 10 to 14 days). Roughly how many days does it take from egg to moth (use the maximum values)? (3 marks)

A survey of woollen sweaters in a class of 40 students showed 25 made of sheep wool, 10 of synthetic fibre and 5 of mixed fibre. Find the percentage of each type. (3 marks)

Read the passage and answer the questions. In the hills of Himachal Pradesh, shepherds take their sheep to high pastures in summer and shear them before winter returns. (i) Name a sheep breed from Himachal Pradesh. (ii) Why is shearing done in summer? (iii) Name the first step after shearing. (5 marks)

Read the passage and answer the questions. Meena visited a sericulture farm in Karnataka. She saw trays of caterpillars eating leaves and tiny white balls hanging on twigs. (i) What were the caterpillars eating? (ii) What were the white balls? (iii) What is done to get silk from them? (5 marks)

Read the passage and answer the questions. A woollen mill worker sorts hair of different textures. He wears a mask and gloves at work. (i) Why are the hair sorted? (ii) Why does he wear a mask and gloves? (iii) Name the disease he is guarding against. (5 marks)

Read the passage and answer the questions. Llamas and alpacas live in the Andes mountains of South America, while yaks live in Ladakh and Tibet. (i) What do these animals provide? (ii) Why do they have thick hair? (iii) Name one Indian animal used for wool in deserts. (5 marks)

Read the passage and answer the questions. A shopkeeper told a customer that a scarf is pure silk. The customer burnt a thread and noticed a smell of burning hair. (i) What does the smell show? (ii) Why does silk smell like burning hair? (iii) What would synthetic fibre do on burning? (5 marks)

Describe the steps in processing fleece into wool with a flowchart and one sentence for each step. (6 marks)

Draw and label the life cycle of the silk moth and explain each stage. (6 marks)

Explain the process of obtaining silk from cocoons, from rearing silkworms to reeling, with a flowchart. (6 marks)

Compare wool and silk under these heads: source, process of obtaining, properties and uses. (6 marks)

Draw an outline map of India and mark the states where Lohi, Rampur bushair, Nali, Bakharwal, Marwari and Patanwadi sheep are reared. Mention one use of the wool of any two. (6 marks)