Drawback of DDT as pesticides is that?

it is less effective than others

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it becomes ineffective after some time

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it is a non-degradable substance

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it is very costly

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Solution

The correct option is C it is a non-degradable substance
$T h e c o r r e c t a n s w e r i s o p t i o n (c) .$

$D D T (d i c h l o r o d i p h e n y l t r i c h l o r o e t h a n e) i s a c o l o u r l e s s, c r y s t a l l i n e, t a s t e l e s s a n d a l m o s t o d o u r l e s s o r g a n o c h l o r i n e u s e d a s p e s t i c i d e$ .

$A p o l l u t a n t t h a t i s n o t b r o k e n d o w n b y n a t u r a l p r o c e s s e s i s k n o w n a s n o n - d e g r a d a b l e s u b s t a n c e .$

$H e n c e D D T i s a n o n - d e g r a d a b l e s u b s t a n c e .$

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