Synthetic fibres melt very soon and easily catch fire. If the clothes catch fire, it can be disastrous.
The fabrics melt and stick to the body of the person wearing them. So, we should avoid wearing them, while working in kitchen.

Acrylic is available in a variety of colours, more durable and affordable which makes it more popular than natural woollen fibres.

We should never wear polyester clothes or synthetic clothes while working in kitchen because synthetic fibres melt on heating. If the clothes catch fire, it can be disastrous. The fabric melts and sticks to the body of the person wearing it.

(i) Thermoplastics
(ii) Thermosetting plastics

The raw materials used in making nylon are coal, water and air.

Plastics take several years to decompose, so they are not environment-friendly. Plastic causes environmental pollution. Besides, the burning process of synthetic material is quite slow and it does not burn completely. In this way, it releases lots of poisonous fumes in the atmosphere causing air pollution.

Plastic is very strong, light and durable. It can be moulded into different shapes and sizes. It is used for various purposes. Plastics are generally cheaper than metals. They are widely used in industry and for household articles.

There are some plastics which when moulded once, cannot be softened by heating. These are called thermosetting plastics e.g., Bakelite and melamine.
Bakelite: It is poor conductor of heat and light.
Melamine: It is fire resistant.

The biodegradable articles are
(a) paper
(b) woollen clothes
(c) wood
(f) peels of vegetables

Thermoplastics get deformed easily on heating and can be bent easily on heating. On the other hand, thermosetting plastics when moulded once cannot be softened on heating.
Thermoplastics ➡️ Polythene and PVC
Thermosetting plastics➡️Bakelite and melamine.

(i) Shruti was aware that plastic is a non-biodegradable material. Disposal of plastic is a major problem. It is not easily decomposed by natural process. So, to avoid the use of plastic she prefers to take steel lunch box.
(ii) No, plastic materials are not environment friendly since, they take several years to decompose and cause environmental pollution. Besides, in the burning process, it releases lots of poisonous fumes (gases) into the atmosphere causing air pollution.
(iii) Shruti is very aware, sensible and intelligent girl.

(a) As a responsible citizen, we must remember the 4-R principle. Reduce, Reuse, Recycle and Recover. Development of these habits is environment friendly. Reduce the use of plastic as it is a nonbiodegradable substance. Reuse such plastic which get deformed easily on heating and can be reshaped in any form. Recycling also reduces the cost of articles and saves resources.
(b) I can contribute at my own level to save the environment as follows:
i) I will not throw plastic bags in the water bodies or on the road.
ii) I will take a cotton bag or a jute bag while going for shopping.
iii) I will try to minimize the use of plastic materials e.g., use a steel lunch box instead of a plastic one.

Plastic is non-biodegradable substance, so it cannot be decomposed. It is creating a great problem for environment. While burning it gives lots of poisonous gases and takes a long time to degrade. This pollution is a major threat to our environment.
(i) Polythene bags are also a big threat to our environment.
They are non-biodegradable substances. When people throw peels of vegetables and left over food items in plastic bags they are eaten by animals such as cows. The plastic material chokes the respiratory system of these animals or forms a lining in their stomach and can be the cause of their death.
(ii) The polybags carelessly thrown here and there are responsible for clogging the drains. Carelessly the wrappers of chips, biscuits etc. are thrown here and there on picnic spots and roads which all create pollution in our environment.
(iii) Plastic wast, when dumped in water,r causes water pollution. Aquatic animals consume these plastics and die.
Hence, the plastics are not environment friendly.

(a) Nikita was aware that plastic is a non-biodegradable material. Disposal of plastic is a major problem. It is not easily decomposed by natural process. So, to avoid the use of plastic she prefer to take steel lunch box.
(b) No, plastic materials are not environment friendly since, it takes several years to decompose and causes environmental pollution. Besides, in the burning process it releases lots of poisonous fumes (gases) into the atmosphere causing air pollution.
(c) Nikita is very aware, sensible and intelligent girl.

(a) Sometimes, the animals (like cow) eat up the polythene bags and wrappers of food along with the left-over food thrown on garbage dumps.
(b) To deelop habits which are environment friendly one should follow 4 R principle which stands for reduce, reuse, recycle and recover.
(c) Karan followed his mother's advice, it shows that he is an intelligent, obedient caring and responsible boy