Ncert Exercises & Solutions

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.