m4 molluscs

Which of the following IS NOT a mollusc?

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What part of a mollusc's anatomy shares its name with a layer of the Earth and is responsible for shielding the visceral mass and in some cases secreting shell?

Molluscs do not have teeth (octopus have a beak), but many molluscs do have a rasplike chitin covered tongue. What is it called?

All molluscs have a small coelom, but many also have larger unrelated cavities containing blood - part of an open circulatory system. What is it called?

Molluscs can best be described as:

• Diploblastic

• Triploblastic acoelomates

• Triploblastic coelomates

• Triploblastic pseudocoelomates

Mollusc blood is called haemolymph. Haemolymph does not contain respiratory blood cells, but it does contain a blue respiratory pigment. What is it called?

• haemoglobin

• haemocyanin

• haemochrome

• haemorrhoids

What is the correct of order of structures that the haemolymph encounters during open circulation?

I heart

II sinuses (haemocoel)

III aorta

IV gills (respiratory organs)

• IV, I, III, II

• IV, II, I, III

• III, I, IV, II

• III, II, I, IV

Gastro is Greek for stomach and pod is Greek for foot. Which one of the following molluscs is a gastropod?

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Most molluscs have an open circulatory system since they have low metabolic rates. Which of the following mollusc classes have a closed circulatory system?

• Gastropoda

• Cephalopoda

• Bivalvia

• Polyplacophora

Which class of mollusc is the only one to have ventured onto land?

• Cephalopod

• Bivalve

• Gastropod

• Polyplacophore