Which one of the following statements is incorrect?

(a) In cockroaches and prawns excretion of waste material occurs through Malpighian tubules.

(b) In ctenophores, locomotion is mediated by comb plates.

(c) In Fasciola Flame cells take part in excretion

(d) Earthworms are hermaphrodites and yet cross fertilisation take place among them.

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Solution

The statement (a) 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, whereas all the other statements are true.

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