Question

Which of the following lacks paired appendages?

• A. Hemichordata
• B. Urochordata
• C. Cephalochordata
• D. All of the above

Answer 1

The correct option is D All of the above

The Urochordata or tunicates and the Cephalochordata or lancelets are the two invertebrate subphyla. Hemichordata is another invertebrate subphylum which comprises the acorn worms. They are close relatives of chordates. This group of organisms is sometimes considered in the chordate group.
The Urochordata are marine organisms. They are filter-feeding animals and have mouth, pharynx and multiple gill slits. They lack paired appendages.
The Cephalochordata is the group which includes several species of lancelets or amphioxi. They are commonly found in shallow water. They are small fish-like organisms. They are also called as filter feeding animals and have a long body pointed at both ends and lacks paired appendages.

Thus, the correct answer is option D.