1.

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.

Answer» 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.


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