Question

Which of the following statements are incorrect?
(i) Parapodia are lateral appendages in arthropods that are used for swimming.
(ii) Rasping mouth-like organ present in molluscs, are involved in excretion.
(iii) Animals of Aschelminthes are dioecious (separate male and female).
(iv) Echinoderms adults show radial symmetry.
(v) Ctenophores are diploblastic.

• A. (i) and (ii)
• B. (i) and (iii)
• C. (i), (iv) and (v)
• D. (iii) and (v)
• E. (ii), (iii) and (iv)

Answer 1

The correct option is A (i) and (ii)

• Aquatic annelids like Nereis possess lateral appendages, parapodia, which help in swimming.
• Animals of phylum Mollusca possess a mouth that contains a file-like rasping organ for feeding, called radula.
• In animals of phylum Aschelminthes, sexes are separate (dioecious) i.e., males and females are distinct.
• The adult echinoderms are radially symmetrical but larvae are bilaterally symmetrical.
• Ctenophores are diploblastic organisms with a tissue level of organization.