Question

Which one of the following phyla is correctly matched with its two general characteristics?

• A. Echinodermata–pentamerous radial symmetry and mostly internal fertilization
• B. Mollusca–normally oviparous and development through a trochophore or veliger larva
• C. Arthropoda–body divided into head, thorax and abdomen and respiration by mouth
• D. Chordata–notochord persists throughout and separate anal and urinary openings to the outside
  

Answer 1

The correct option is B Mollusca–normally oviparous and development through a trochophore or veliger larva

Mollusca is normally oviparous and its development may be direct or indirect. If development is indirect, then it occurs through trochophore or veliger larva.

Echinoderms show bilateral symmetry in larvae but pentamerous radial symmetry in adult. Fertilization is external in them.

In arthopods, body is divided into head, thorax and abdomen. Respiratory organs consists of book gills, book lungs and tracheae.

Notochord is present in chordates at some stage of their lives. Urinary and anal openings, may or may not be separate.