Answer:
(b) Ozone is triatomic allotrope (occurrence
of one element in more than one form) of oxygen. It is a blue gas with pungent
odour and is highly poisonous to the living system.
It is present in stratosphere region of atmosphere
however, it does not exists in the lower atmosphere region called troposphere,
hence does not show any fatal effect on life forms. If its value in the atmosphere
increases the appreciable amount, it may become fatal, i.e., become poisonous
and will kill all the living forms.
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