Questions

The error is in first part. Replace ‘whom’ with ‘who’. ‘Whom’ is a pronoun which is the objective case of the pronoun ‘who’. But who is the subject in the given sentence, and hence usage of ‘whom’ is incorrect here.

Loktak Lake:the largest freshwater  (sweet)  lake  in  North -East  India,  also  called  the  only Floating  lake  in  the  world  due to the floating phumdis (heterogeneous mass of vegetation,    soil,    and    organic matters    at    various    stages    of decomposition)   on   it,   is   located near   Moirang   in   Manipur   state, India.  The  etymology  of  Loktak  is Lok  =  "stream"  and  tak  =  "the end"