Q.

Xenobiotics which are inherently resistant to microbial attack are called as:

A. Biodegradable
B. Persistent
C. All of the given options
D. Recalcitrant
Answer» D. Recalcitrant
Explanation: The compounds that resist biodegradation and thereby persist in the environment are called recalcitrant. The recalcitrant xenobiotic compounds can be grouped into the following six types: (i) halocarbons; (ii) polychlorinated biphenyls; (iii) synthetic polymers; (iv) alkylbenzyl sulphonates; (v) oil mixture and (vi) others.
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