Mollusk Video Lesson

What was the first mollusk like?

• Free swimming soft bodied animals

• benthic autotrophs

• benthic hard shelled heterotrophs

What evolutionary advantage did mollusks have?

• able to make slight changes to their body plan

• all became a predator instead of being prey

• use photosynthesis when food is not available

What are the main body structures that most mollusks have?

• Foot, head, mantle

• mantle, foot, radula

• foot, radula, shell

The muscular foot of certain species of mollusk can be used for

• Locomotion, catching prey

• escaping, consuming light

• holding on to rock, mating

True/False: All radula are structured and function the same

• True

• False

True/False: When mollusk first evolved they were benthic (bottom dwelling) organisms

• True

• False

Mollusk that are nekton (free swimming) had to redesign their foot in order to gain ...

• tentacles

• buoyancy

• air bladder

Why did some mollusk evolve to lose their shells?

• In order to have internal structural support

• In order to gain speed

• They needed longer tentacles to catch prey

Which mollusk made the most drastic change to the original body plan?

• moon snail

• octopus

• squid

Which of the following mollusk developed a central nerve area aka a brain?

• giant clam

• nautilus

• octopus