Draw a well labelled diagram showing the alimentary canal of cockroach and label any four parts. What is meant by paurometabolous development in cockroach?

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Solution

The development of Periplaneta americana (cockroach) is of paurometabolous type, meaning there is development through the nymphal stage. The nymph looks very much similar to the adult form. The nymph molts about 13 times before reaching the adult form. The next to last nymphal stage has wing pads but only adult cockroach has wings.

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