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Invertebrates > PHYLUM MOLLUSCA > Flashcards

PHYLUM MOLLUSCA Flashcards

1
Q

Name the characteristics of his phylum

A

Triploblastic, bilaterally symmetrical, unsegmented, true coelom, protostomes

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2
Q

What is some general information about this phylum?

A

Economy, flatworms are in the 3rd dimension, visceral mass, specialized organs

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3
Q

What does the osphradia do?

A

Monitor the water flow over the gills/ctenidia

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4
Q

What is the name of the generalised mollusc?

A

Archimollusc

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5
Q

What is a radula, its function and what is it supported by?

A

Teeth-like conveyer belt for feeding. Primitive grazers have it. Supported by odontophores

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6
Q

What is the shell secreted by and how many layers are there?

A

The mantle, there are 3

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7
Q

Name the layers of the shell

A

Periostracum, prismatic & nacreous

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8
Q

Describe the periostracum layer?

A

Organic layer, dark conchiolin

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9
Q

Describe the prismatic layer?

A

CaCO2, prisms in the protein matrix

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10
Q

Describe the nacreous layer?

A

Plate-like, CaCO2 crystals, pearly

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11
Q

How are pearls formed?

A

Particles become trapped between the nacreous and epidermis layers and irritates the mollusc. It coats it in calcium carbonate

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12
Q

The circulatory system in molluscs is open, true or false?

A

True, except in Cephalopoda

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13
Q

How many oracles and ventricles does mollusca have?

A

2 oracles, one ventricle

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14
Q

Name the elements of the c.s

A

some blood vessels, haemocyanin and the heart is in the coelomic cavity.

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15
Q

What is the pericardium?

A

The coelomic cavity

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16
Q

What is haemocyanin?

A

A protein containing copper that transports oxygen in invertebrates

17
Q

What parts are ciliated in the digestive system of mollusca?

A

All parts

18
Q

Where do the salivary glands open up to?

A

The oesophagus

19
Q

Describe the d.s process

A

Salivary glands secrete mucus, mucus/food string is formed in oesophagus, pulled into stomach by cilia, rotated, protostyle, intra/extra cellular digestion

20
Q

What is the protostyle?

A

Food laden mucus mass

21
Q

What is the excretion process?

A

The metanephridia drain pericardial cavity and empty into the mantle cavity

22
Q

What do the gonads arise from?

A

The coelom

23
Q

What is the one word that describes reproduction in mollusca

A

Parthenogenesis

24
Q

What is parthenogenesis?

A

Reproduction via unfertilized gametes

25
Q

Describe the reproduction process

A

Egg and sperm are released into the environment and fertilization occurs there

26
Q

What is the nervous system like?

A

Advanced, has sense organs, nerve ganglia, paired pedal/palial nerve cords, dorsal/ventral cords

Invertebrates (2 decks)

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