Which one of the following statements is incorrect?
| 1. | In cockroaches and prawns, excretion of waste material occurs through Malpighian tubules. |
| 2. | In ctenophores, locomotion is mediated by comb plates. |
| 3. | In Fasciola, flame cells take part in excretion. |
| 4. | Earthworms are hermaphrodites and yet cross-fertilization takes place among them. |
(1) The statement (1) is incorrect because Malpighian tubules are excretory structures in most of the insects, including cochroach , but green glands perform excretory functions in crustaceans like prawns, eheras all the other statements are true .
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