Science-- ch- Fibre to fabric(Topics taught, Homework,Additional Questions)

27/4/2020
Topics taught-- History of clothing, fibre,types of fibre natural and synthetic
Natural fibre Cotton(bolls,picking,ginning)
Revise the topic taught from ppt,video(betweenus-student resources) and textbook .

28/4/2020

Topics taught--Natural fibres --Cotton,jute
Animal fibres-- wool,silk
Revise the topics taught from between us student resources,ppt and video.Also refer textbook.

29/4/2020

Topics taught-- Spinning, Weaving,Knitting From textbook between us student resources,watch all videos and ppt
Hw Revise the ch Fibres to fabric

30/4/2020
Please complete notebook (textbook) exercise and workbook exercise(only answers) .Answers of the same are also uploaded on blogspot.
Complete the work and send pics through mail ...Mail id inshiya.dholkawala@podar.org till Monday 4/5/2020
Science

Important questions

 Chapter 3 – Fibre to fabric

Fill in the blanks

1.    Clothes are made from___________

Answer- fibres

2.    Fibres are woven to form

Answer- fabric

3.    Name one process used for making fabric from the fibre

Answer-weaving

4.    Silk fibre is obtained from

Answer- cocoon of silkworm.

5.    Name on natural and one artificial fibre

Answer- cotton is natural and nylon is artificial fibre.

Very Short Answer Question

1.    What is fibre?

 Answer: A material which is present in the form of thin and continuous strand is defined as fibre.

2.    Define natural fibres?

Answer: Fibres which are obtained from plant and animal sources, they are known as natural fibres.

3.    What are synthetic fibres?

Answer: Fibres which are obtained from some industrial process or man-made fibres are known as synthetic fibres.

4.    Define weaving?

Answer: The process of arranging two yarns together so that a fabric can be produced, is known as weaving.

5.    Name two uses of cotton?

 Answer: It is used to make bed sheets, curtains saris, towels etc.

6.    Advantages of synthetic fibre?

 Answer: They are strong, resistant to wrinkles and easy to dry.

7.    Name the two types of fabrics?

 Answer: Natural fabrics and synthetic fabric are two types of fabrics.

8.    Name two fabrics that are obtained from plant source?

Answer: Cotton and jute are two fabrics obtained from plant source.

9.    Name two fabrics obtained from animal source?

 Answer: Silk and wool are two fabrics obtained from animal source.

10.           What is retting?

 Answer: In this process, the stems of the plants are rotten in water in order to remove sticky substance and separate fibres.

Long Answer Questions

1.    What is silk and how it is made?

Answer: Silk is produced from silk worm. Silk fibre is obtained from the cocoons of the silk moth. There are four stages in the life cycle of silk moth: eggs, larva, pupa and adult. The larva of the silk moth is called caterpillar. It secretes a sticky fluid fibroin from its salivary gland. This sticky fluid forms a long thread. This thread is then wrapped around the body of the caterpillar and forms cocoon. After this stage, the larva becomes a pupa and then turns into an adult moth. Silk is a costly fabric. Silk fibre is used for weaving cloth ; especially traditional dresses in India; like sari, kurta, shawl and other wedding clothes. Silk had always been prized for its lustre and fine quality.

2.    Explain the steps in making cotton yarn?

 Answer: a. First of all, raw cotton is loosened and cleaned in order to remove straw and dried leaves.

b. Then the cotton is fed into machine. This converts the cotton fibre into rope like structure called silver.

 c. The silver of cotton fibre is converted into yarn through spinning by using the machines.

 3. Name and explain different types of fibre?

Answer: Four main types of fibre are natural fibres, synthetic fibre, plant fibre and animal fibre. Fibres obtained from plant and animal are known as natural fibres. Such as cotton, jute etc. Fibres produced in the industries are known as synthetic fibre. Such as nylon. Fibre obtained from plant source are known as plant fibre such as cotton and jute. Fibre obtained from animal source is known as animal fibre such as silk and wool.

KEYPOINTS:-

·                   The different types of food products that are obtained from plants are called plant sources of food.

·                   Various food products such as vegetables, fruits, grains, pulses, cereals, tubers etc are obtained from plants.

·                   The different types of food products that are obtained from animals are called animal sources of food.

·                   Milk, eggs, honey, meat, fish and crabs are some examples of food obtained from animals.

·       Depending on food habits, animals are categorised as herbivores, carnivores, omnivores, scavengers and decomposers.