No, the handle and bristles of a tooth brush should not be made of the same material because the bristles should be soft and the handle should be hard. So the bristles should be made up of soft material so that it does not harm the gums. The handles should be made up of hard material so that it can give firm grip. 

Plastics are harmful for our environment. Plastics are non- biodegradable. It add pollution to the environment. They cannot be burnt because, when they burnt they release poisonous gases. Some of the plastics cannot be recycled, so they cannot be used again and thus cannot be finally disposed off. They thus, should be avoided as far as possible.

Following examples show that plastics are non-corrosive in nature :

(i) They are used to store chemicals. For example cleansing chemical are very reacticve and store in plastic bottle.

(ii) They are used to store all types of food, as it does not react to materials stored in it.

(iii) It does not even react with air and water.

1) Cotton clothes are preferred to synthetic clothes in summers because cotton allows better air circulation, which helps in absorbing and removing body moisture caused by sweat. It therefore minimizes fungal breeding by keeping your body dry and cool.

2) Cotton is light in weight and in colour unless it is dyed. being light coloured will help the light to pass through instead of being absorbed and hence we will not feel the heat as much.