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Ans-
The answer is the option (a), in cockroaches and prawns excretion of waste material
occurs through malpighian tubules.
Explanation:
The expression, “In cockroaches and prawns excretion of waste material occurs through malpighian tubules” is incorrect because Malpighian tubules are excretory structures in most of the insects, including cockroach, but green glands perform excretory functions in crustaceans like prawns. Rest all other statements are true.