CBSE Class 6 Science Chapter 3: Fibre to Fabric NCERT Solutions

Solution:

Fibres can be classified based on their origin:

Natural Fibres: These fibres are obtained from natural sources, either plants or animals.

From plants: cotton, jute

From animals: wool, silk

Therefore, the natural fibres from the given list are: wool, cotton, silk, jute.

Synthetic Fibres: These fibres are man-made and are produced from chemical substances.

From the given list, nylon and polyester are synthetic fibres.

Therefore, the synthetic fibres from the given list are: nylon, polyester.

Solution:

Let's evaluate each statement:

a) Yarn is made from fibres. (True) - Yarn is produced by spinning fibres together.

b) Spinning is a process of making fibres. (False) - Spinning is the process of making yarn from fibres, not making fibres themselves.

c) Jute is the outer covering of coconut. (False) - Jute fibre is obtained from the stem of the jute plant. The outer covering of coconut is coir.

d) The process of removing seed from cotton is called ginning. (True) - Ginning is the mechanical process of separating cotton fibres from seeds.

e) Weaving of yarn makes a piece of fabric. (True) - Weaving is one of the main processes used to create fabric from yarn.

f) Silk fibre is obtained from the stem of a plant. (False) - Silk fibre is an animal fibre obtained from the cocoons spun by silkworms.

g) Polyester is a natural fibre. (False) - Polyester is a synthetic (man-made) fibre.

Solution:

a) Plant fibres are obtained from sources like the cotton plant (from its fruit) and the jute plant (from its stem).

b) Animal fibres are obtained from animals. The two main animal fibres discussed are wool (from sheep) and silk (from silkworms).

Solution:

Cotton: Cotton fibre is obtained from the cotton plant. Specifically, it comes from the fluffy balls that grow on the cotton plant, which are the fruits of the plant. These are often referred to as cotton balls or bolls.

Jute: Jute fibre is obtained from the stem of the jute plant. After the plant is harvested, the stem is processed (usually by soaking in water) to separate the fibres.

Solution:

Coconut fibre, commonly known as coir, is a coarse fibre extracted from the outer husk of coconuts. It is known for its durability and resistance to saltwater. Two common items made from coconut fibre are:

• Ropes: Coir is widely used to make strong ropes.
• Mats and Brushes: It is also used for making floor mats, doormats, and brushes.
• Sacks and Bags: Jute bags are common, and while the question asks for coconut fibre, it's worth noting that jute is also used for bags. However, focusing on coconut fibre, items like coarse sacks can be made.

The provided source mentions 'Jute bags, ropes and Foot mats.' While jute bags are made from jute, ropes and foot mats can be made from both jute and coconut fibre. For coconut fibre specifically, ropes and mats are primary examples. Let's list two distinct items made from coconut fibre: Ropes and Foot mats. (Note: The source's mention of 'Jute bags' is for jute, not coconut fibre.)

Solution:

The process of making yarn from fibres is called spinning. This fundamental process involves taking a mass of fibres and preparing them for twisting.

Here's a breakdown of the process:

1. Drawing Out: Fibres are drawn out from a sliver (a loose rope-like bundle of fibres).
2. Twisting: The drawn-out fibres are then twisted together. This twisting action is crucial as it binds the fibres securely, giving the yarn strength and cohesion.

Historically and even today in some rural areas, spinning is done using simple hand-operated devices such as the hand spindle (also known as 'takli') and the charkha. On an industrial scale, large and sophisticated spinning machines are used to produce yarn efficiently and in vast quantities.