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NEET AIPMT SOLVED PAPER 2003

  • question_answer
                    During anaerobic digestion of organic waste, such as in producing biogas, which one of the following is left undegraded?                                                                                                                                                               

    A)                 Hemicellulose                      

    B)                 Cellulose               

    C)                 Lipids     

    D)                 Lignin

    Correct Answer: D

    Solution :

                    During bio-gas formation, digestion of cellulose is slow (rate-limiting) and most of the lignin is not decomposed. After cellulose lignin is the most abundant plant polymer. It forms 20 to 30% of the wood of the tree, lignin is a complex polymeric molecule, made up of phenyl propanoid units. Cellulose is a large chained polymer of glucose molecules which are linked with each other by glycosidic bonds. Hemicellulose are branched polymers of glucose, xylose, galactose, mannose and arabinose.


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