Frog excretes urea whereas tadpole excretes ammonia. Frog excretes urea because urea is less toxic than ammonia and can be concentrated in urine and excreted at a slower rate. Whereas tadpole excretes ammonia because it lives in water and has the large volume of water that is needed for the elimination of ammonia. It can eliminate ammonia into surrounding water rapidly when it is formed.
So, the correct answer is 'Urea, Ammonia'.
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Q1
Marine teleost fishes excrete (a) Uric acid. (b) Ammonia (c) Urea. (d) None of these