Which of the following is not true of eukaryotic cell

Dear Student, 
option A is correct. Birds are called uricotelic as they excrete nitrogenous waste materials by turning it into uric acid. 

option B is incorrect. Insects are uricoteluc not ureotelic(excrete waste in form of urea).
option c is correct  Tadpole is ammonotelic as it excretes ammonia. 
option D is correct. Elephant are mammals and mammals are ureotelic.

Hence, the correct option for this question is obtion B. 

Regards.