Exploring the World of Molluscs

The video explores the diverse world of molluscs, a phylum with over 85,000 species, including snails, clams, and squid. It covers their anatomy, such as the head, visceral mass, and foot, and highlights different classes like gastropods, bivalves, and cephalopods. Each class has unique features, from the shells of gastropods to the advanced eyes of cephalopods. The video emphasizes the evolutionary connections among these varied creatures, showcasing their adaptations and ecological roles.

What are the three main body regions of molluscs?

• Head, visceral mass, and foot

• Head, tail, and shell

• Visceral mass, shell, and tentacles

• Foot, shell, and radula

Which class of molluscs is known for having a 'stomach-foot'?

• Bivalvia

• Cephalopoda

• Gastropoda

• Polyplacophora

What is a unique feature of nudibranchs?

• They have a hard shell

• They have a beak like a parrot

• They have cerata with stinging cells

• They are exclusively land-dwelling

What does the term 'bivalve' refer to?

• Animals with two shells

• Animals with a single shell

• Animals with a soft body

• Animals with no shell

Which bivalve is known for its invasiveness in U.S. waterways?

• Oyster

• Scallop

• Giant clam

• Zebra mussel

What is the primary method of feeding for most bivalves?

• Photosynthesis

• Filter feeding

• Hunting with venomous harpoons

• Scavenging

What is a distinctive feature of cephalopods compared to other molluscs?

• They lack a foot

• They are all land-dwelling

• They have a hard external shell

• They have a well-developed nervous system

Which cephalopod is known for having a venomous bite that can be lethal to humans?

• Nautilus

• Cuttlefish

• Blue Ringed Octopus

• Giant squid

How many arms do squid and cuttlefish have?

• Eight

• Ten

• Six

• Twelve

What is the significance of the cephalopod eye in evolutionary biology?

• It is used primarily for detecting light

• It is less advanced than other mollusc eyes

• It evolved from a different origin but functions similarly to mammalian eyes

• It is identical to mammalian eyes