General Science Solutions Solutions for Class 6 Science Chapter 6 Substances In Daily Use are provided here with simple step-by-step explanations. These solutions for Substances In Daily Use are extremely popular among Class 6 students for Science Substances In Daily Use Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the General Science Solutions Book of Class 6 Science Chapter 6 are provided here for you for free. You will also love the ad-free experience on Meritnation’s General Science Solutions Solutions. All General Science Solutions Solutions for class Class 6 Science are prepared by experts and are 100% accurate.

#### Question 1:

Fill in the blanks using proper words.
(a) Rubber made by vulcanization is a ...... material.
(c) ............. thread was developed simultaneously in New York and London.
(d) Rayon is also known as ............

(c) Nylon thread was developed simultaneously in New York and London.
(d) Rayon is also known as synthetic silk.

#### Question 2:

(a) Why did the need for man-made materials arise?
(b) Which are the natural materials obtained from plants and animals?
(c) What is vulcanization?
(d) Which natural materials are used to obtain fibres?

a. For several years, humans have been dependant on natural materials to meet their demands. However, there has been a shift towards the use of man made materials as well. Increasing population, deforestation and limited natural resources are some of the reasons due to which the need for man made materials arised. Another reason which led to the increase in the use of man made material was to get a comfortable lifestyle.

b.
 Sources Natural material Objects Plants Wood Furniture Rubber Ballon, tyres etc. Cotton Clothes Animals Fur Hats, Sweaters Leather Handbags, shoes Silk Sarees

c. Vulcanization is the process carried out for the production of rubber. In this process, raw rubber is heated with a mixture of sulphur and an appropriate additive, at a temperature range of 61.85${0}^{}$ C to 141.850C for three to four hours. Sulphur is added to give toughness to rubber.

d. Natural materials obtained from plants and animals are used to obtain fibers. For example, wool and silk are natural materials of animal origin which are used for obtaining fibers. Wool is obtained from the fleece (hair) of sheep or yak and silk is obtained from the cocoons of a silk moth. Cotton and jute are examples of natural materials of plant origin which are used for obtaining fibers.

#### Question 3:

What are we used for ?
(a) Soil
(b) Wood
(c) Nylon
(d) Paper
(e) Rubber

a. Soil- It is used in construction, pottery, medicine and cosmetics.
b. Wood- It is used in making furnitures, as a source of fuel, utensils, hand tools, musical instruments, wooden toys etc.
c. Nylon- It is used in making canopies of parachutes, tents, sleeping bags, sails, rope, tennis strings, fishing poles and lines, cookware etc.
d. Paper- It is used in making bags, envelopes, notebooks, packaging purpose etc.
e. Rubber- Balloons, erasers, rubber toys, rubber balls etc.

#### Question 4:

How is paper manufactured? Write in your own words.

Paper is manufactured by the following process:

• Logs of wood are made to pass through a debarker, where the barks of the tree are separated.
• Then the wood is chopped into small pieces and is mixed with some chemicals and water in digetser for the formation of the pulp.
• The obtained pulp is washed refined and sometimes even bleached.
• The pulp is made to travel down the screen to remove excess of water and then to the rollers where it is being dried and squeezed between large rollers to form rolls of paper.

#### Question 5:

Give scientific reasons.
(a) We must use cotton clothes in summer.
(b) We must observe economy in the use of materials.
(c) Saving paper is the need of the hour.
(d) Man-made materials have more demand.
(e) Humus is a natural material.

a. We must use cotton clothes in summers because they protect us from the heat of the sun. They absorb sweat and help keep our bodies cool. The pores in cotton clothes allow the free movement of air, which helps cool our bodies.

b. We must observe economy in the use of materials because they directly or indirectly affect our environment. Most of the natural materials which we obtain from our environment are exhaustible/non renewable resources i.e. once these resources are finished they cannot be renewed again or even if they can, it would take several years to do so. For example, our forests from where we obtain wood are precious resources because once a forest is destroyed, it would take several years to renew that forest. Also, destroying the forests for our needs affects the habitat of several other species of organisms and plants. The man made materials which we use are largely non biodegradable for example plastic etc. Increased use of man made materials pose a threat to the environment because their disposal is not easy and leads to environmental pollution. These examples state the importance of judicious use of both natural and man made materials.

c. We very well know that paper is obtained from trees. Trees are important resources because they not only provide us with wood or paper but are also a habitat for various organisms. They are important in maintaining the climate as well. The more paper we use or waste, the more no. of trees will have to be cut down for this purpose, thus leading to v arious kinds of harmful effects on our environment. We should make a genuine effort in saving paper by adopting small steps which can make a huge difference.

d. Man made materials have more demand because of their characteristics like easy to use, low cost of production, cheaper products and variety of things which can be made from them.

e. Humus is a natural material because its formation is a natural process. It is the dark-coloured layer of top soil that is rich in nutrients. The decomposers convert the dead plants and animals into humus that is utilised by the plants. It increases the fertility of the soil.

#### Question 6:

Find out.
(1) How is lac obtained from nature?
(2) How are pearls obtained?