AP BIOLOGY

Detailed explanation-1: -Birds excrete nitrogenous wastes as uric acid in the form of pellet or paste with minimum loss of water and are called uricotelic animals.

Detailed explanation-2: -Birds excrete their nitrogenous wastes as uric acid in the form of a paste. Although this process is metabolically more expensive, it allows more efficient water retention and it can be stored more easily in the egg.

Detailed explanation-3: -Lizards, snakes, birds and insects excrete mostly uric acid but crocodiles and alligators excrete mainly ammonia though they are reptiles. On the basis of this can we generalise that :-There is no uniform pattern of removal of nitrogen wastes.