Department of Zoology, University of Calicut, Calicut - 673 635, Kerala, India.
The levels of urea and arginase decreased sharply during the development of the silkworm pupa but their levels rose during the adult development. The changing levels of urea and arginase during pupal and adult development indicated the metabolic origin of urea and there was no accumulation of urea during the period of water shortage.
