Important Questions for CBSE Class 7 Science Chapter 3 - Fibre to Fabric (Not in the Current Syllabus)

Very Short Answer Questions(1 Mark)

1. Wool is obtained from                    of the sheep.

Ans: Wool is obtained from Fleece of the sheep.

2. Angora wool is obtained from                    .

Ans: Angora wool is obtained from Angora goats.

3. Wool from the Kashmiri goat is used to prepare                      .

Ans: Wool from the Kashmiri goat is used to prepare Pashmina shawls.

4. Silk is obtained from the silk moth                     .

Ans: Silk is obtained from the silk moth Bombyx mori.

5. Silk fibres are found in                    stage of the silk moth. 

Ans: Silk fibres are found in the Cocoon/pupa stage of the silk moth. 

Short Answer Questions (2 Marks)

1. Explain selective breeding.

Ans: Selective breeding is the process of selecting parents of animals for obtaining desired special characters in their offspring. For example, only  some breeds of sheep possess fine under-hair so their parents are chosen to give birth to sheep which have only soft under-hair. Selective breeding has been practised for a long time in order to select and propagate superior varieties of animals.

2. What is shearing?

Ans: Shearing is the removal of fleece or fur along with a thin layer of skin of the sheep in order to process the fleece into wool. Shearing is not a painful process for the sheep as the uppermost skin layer is made up of dead cells and its hair grows again. Shearing is usually done in summers so that the sheep are able to survive the hot weather without their protective  coat of fur.

3. Why is scouring important?

Ans: Scouring is the process of cleaning the sheared skin with hair 

thoroughly using water and chemicals in tanks to remove the dirt,  dust, grease and grime from the fleece. This is important so as to clean the wool fibres and to remove unwanted substances. Nowadays machines are used for the scouring process.

4. What is the purpose of sorting the different fibres of wool?

Ans: The fibres of wool have to be sorted into different sections according to their quality. This is important so as to organise the different fibres of  the wool. This helps to send  hairy skin  to the factory where hair of different textures is sorted. And same quality wool obtained from this to mix together.

5. What is the occupational hazard for the workers in the wool industry?

Ans: Occupational hazard is a risk faced by the workers due to the occupation that they belong to. For workers in the wool industry the main occupational hazard is Sorter’s disease which is a fatal blood disease. This is because cattle like sheep are a natural host for the anthrax bacterium. Therefore, any workers who are directly exposed to the fur of the sheep are at high risk of getting infected by bacteria and anthrax.

6. What is sericulture?

Ans: Sericulture is the practice of rearing silkworms for the purpose of production of silk. It involves all practices related to breeding, heeding, weeding and feeding of the silk moth. The most common silk moth is Bombyx mori that feeds on the leaves of the mulberry tree. Sericulture is a very old occupation in India.  

7. What is meant by reeling of silk?

Ans: Reeling of silk is the process in which threads are taken out from the cocoons to use as silk. Separation of silk fibres from cocoons can be done by   keeping them under the sun or by boiling or exposing them to steam. Special machinery is used for reeling.

8. What stage of silk moth produces the silk fibres?

Ans: Caterpillars or silkworms are formed from the female silk moth eggs. From the female silk moth eggs hatch larvae that are caterpillars. When the caterpillar is ready for the next stage called pupa, it needs to hold itself to a net. Caterpillar swings its head in the form of digit eight. During this movement, it releases a fibre that is made up of protein. Due to exposure to air, this fibre hardens and becomes silk fibre. Thus, the silk fibres are formed by the later stages of larvae and just before they form the pupa. 

9. What are silk fibres made up of?

Ans: Silk fibres are made up of proteins that are released by the caterpillars or silkworms. On exposure to air, this fibre made of a protein hardens and becomes silk fibre. 

10. Which animals can be used to obtain wool? List a few of the different kinds of silk.

Ans: The mountain goat, Angora goat, Kashmiri goat, llama, alpaca and camel are some of the animals from which wool can be obtained.

A few varieties of silk are mulberry silk, Tussar silk, Muga silk, Eri silk, etc.

Long Answer Questions (5 Marks)

1. Draw the life cycle of a silk moth

Ans: The stages in the life cycle of a silk moth,

• Egg

• Larva

• cocoon 

• Adult moth/silk moth

Caterpillars or silkworms are formed from the female silk moth eggs. From the female silk moth eggs hatch larvae that are caterpillars. When the caterpillar is ready for the next stage called pupa, it needs to hold itself to a net. Caterpillar swings its head in the form of digit eight. During this movement, it releases a fibre that is made up of protein. Due to exposure to air, this fibre hardens and becomes silk fibre. Then the caterpillar uses silk fibres to cover itself completely; this covering is a cocoon. Next, it will turn into a pupa, further development of the pupa into moths continues inside the cocoon.

Life Cycle of Silk moth

Motion and Measurement of Distance: Class 6 Science Chapter 10 Important Questions Summary

As mentioned earlier, this chapter is very crucial for the students of Class 6. By understanding all the concepts of this chapter, they will be able to prepare a foundation of knowledge. This knowledge will then be used to learn the advanced concepts in the higher classes such as motion, acceleration, vector quantities, laws of motion, etc. The Important Questions for Class 6 Science Chapter 10 ensure that the students are on the right track. By answering these questions and referring to their solutions, they will be able to get a good hold of the concepts.

The chapter focuses on defining new scientific terms such as motion, distance, etc. The students will learn when a body is said to be in motion. They will also learn how it is decided that a body is moving when compared to a reference frame. On proceeding further in the chapter, the students of Class 6 will learn about the different means of transport used by modern civilization these days. They will also learn how the locomotives and automobiles evolved from prehistoric cartwheels. The Class 6 Science Chapter 10 Important Questions will also be based on what the students are learning here in this chapter.

In the next segment, the students will learn about how measurement is done. They will be fascinated to know that measurement of small lengths is easier but measuring long distances with bigger units is not that easy. By considering the answers to the NCERT Class 6 Science Chapter 10 Important Questions based on this topic, they will learn how a unit of distance and length is the same and is determined. They will also discover how length and distance are measured following traditional ways.

The next segment will teach students how units are determined and distinguished.   They will also understand why a unit is standardized across the world. The concept of units for measuring any physical quantity will start building from this chapter. The conversion of units into smaller or bigger units will also be taught here. Hence, Motion and Measurement of Distances Class 6 Important Questions are quite important for the students to clear their concepts.

In the next section, students will learn how to measure a length using a scale. There are several errors that they have to avoid while measuring a length with the use of a scale. Those errors will be described well in the chapter. The Important Questions for Class 6 Science Chapter 10 will then be used to define the errors in a better way. Students will also learn how to measure a curved line after mastering the measuring technique of a straight line.

In the next segment, the chapter will introduce the students to motion. They will learn the types of motion and how to explain them. They will also learn how distance and time are important to measure motion.

Why Should You Download Important Questions on Motion and Measurement of Distances?

The reason for downloading these important questions for Class 6 Science Chapter 10 is to gain more knowledge based on distance, measurement, and motion. This chapter is very crucial for the foundational development of the students. This base of knowledge will then be used to learn new related concepts in the advanced classes. The definition of units for measuring a physical quantity will also be introduced in this chapter.

By referring to the important questions, students will also find out what other question formats exist. It will help them to use the concepts well and answer them confidently.

Benefits of CBSE Class 7 Science Important Questions

Some of the benefits of solving CBSE Class 7 Science Important Questions are given below:

• These important questions are made by our experts referring to the CBSE syllabus, therefore, solving these questions will help you to understand the topics clearly.

• These questions will help you prepare for the examination and you will be well aware of the type of questions that can be asked in the exam.

• CBSE Class 7 Science Important Questions available at Vedantu are solved by our experts with 100% accuracy, therefore, you can completely rely on them for your preparation.

• These important questions are available in PDF format which can be downloaded for free and students can access them anytime.

Kick-start your Class 7 Science preparation with these important questions and clear your concepts on the Chapter Fibre to Fabric. For more information and study related materials, visit Vedantu.