Question

Shell is absent in:

• A. Octopus
• B. Sepia
• C. Nautilus
• D. All of the above

Answer 1

The correct option is A Octopus

Octopus is mollusc without a shell. An octopus has no internal or external skeleton allowing it to squeeze through tight places. They have neither a protective outer shell like the nautilus nor any vestige of an internal shell or bones, like cuttlefish or squid.

So, the correct answer is option A.