A) vessels
B) tracheids
C) fibres
D) parenchyma
Correct Answer: A
Solution :
Unwanted sound dumped into the atmosphere is called noise pollution. Release or occurrence of any foreign materials or gases in the atmosphere which may harmful to humans, animals and vegetations etc., is known as air pollution. Porous wood contains vessels, e.g., Wood of angiosperm which may be ring porous or diffuse porous.
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