Cephalopods, Scaphopoda and Polyplacophora

Cephalopods move by

• using jet propulsion
• waving their tentacles back and forth.
• crawling along on a single muscular foot.
• clapping their shells together.

Which of these cephalopods has an external shell?

• cuttlefish
• squid
• octopus
• nautilus

Which of the following is a function of the mantle in many mollusks?

• Mantle covers the internal organs.
• Mantle enables the mollusk to move.
• Mantle helps the mollusk digest food.
• Mantle removes wastes.

Among mollusks, which is a special characteristic of cephalopods?

• an open circulatory system.
• a two way digestive system.
• the only mollusk class with gills.
• a closed circulatory system.

What does Cephalopod mean?

• means "2-shells"
• means "head-foot"
• means "stomach-foot"
• means "soft bodied"

Mollusk's tongue-like strip covered with teeth that point backwards is called the 

• gills
• beak
• visceral mass
• radula

Structures on cephalopods that act as a water pump for jet propulsion are called 

• siphons
• gills
• radulas
• trochopores

Which group of cephalopods can inject prey with a neurotoxic venom? 

• Cuttlefish
• Nautilus
• Squid
• Octopuses

What is found on the tentacles of squid and cuttlefish?

• Suction cups all the way down the entire length of their tentacles

• Suction cups only on the clubs of tentacles

Which group of cephalopods has ability to flatten body to fit in small spaces and change skin to blend with surroundings?

• Cuttlefish
• Nautilus
• Squid
• Octopuses