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
PC (e) Humus is a natural material,
[
Answers
Answer:
a) Cotton clothes keep us cool as there is small gaps between fiber of cotton there will be ventilation of air so it will keep us cool.
b) Sorry i dont know this.
c)We must save paper as paper is made of many trees we should save paper
d) Man materials have more demand as man labour takes more money to work compared to machines so man has more demand and if man has to work he needs to have AC, Fans etc.
e) I dont know this also
Explanation: Mark me as the brainliest
Explanation:
We sweat more in the summer session. Cotton is a strong water absorber helps to absorb the sweat and introduce to the environment of evaporation. Our body takes out heat as the sweat evaporates from our body
We must observe economy in the use of materials because they directly or indirectly affect our environment. ... Increased use of man made materials pose a threat to the environment because their disposal is not easy and leads to environmental pollution
Paper should be saved because it takes around seventeen full grown trees to make one tonne of paper. Trees ,as we know,are important to maintain a balance of nature. Therefore,'in order to save trees and prevent the impact of their loss on living organisms,we need to save paper.
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
as humans are evolved from basic structured organisms which are created by nature ,we can simply say that humans are natural material