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Biology > Phylum Platyhelminthes > Flashcards

Phylum Platyhelminthes Flashcards

1
Q

Platyhelminthes embryonic tissue layers

A

Ectoderm
Mesoderm
Endoderm

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2
Q

3rd tissue layer between epidermis and digestive cavity

A

Mesoderm

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3
Q

Function of mesoderm

A

allows for development of muscle layers in body wall
allows for more elaborate organs, specialization, and greater division of labor than in cnidaria

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4
Q

The only internal space

A

digestive cavity

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5
Q

Advantages of flat body

A

allows them to rely on diffusion for exchange of gasses, nutrients, and wastes

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6
Q

Acoelomate

A

no body cavity

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7
Q

what does embryonic tissue ectoderm turn into

A

epidermis

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8
Q

what does embryonic tissue mesoderm turn into

A

Parenchyma

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9
Q

what does embryonic tissue endoderm turn into

A

Gastrodermis

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10
Q

The 2 layers surrounding body wall

A

Circular muscle
Longitudinal muscle

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11
Q

Feeding and Digestion

A

Carnivores
Endoparasites
Incomplete digestive tract

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12
Q

Respiration

A

No respiratory system
Gas exchange through flattened body wall

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13
Q

Excretion

A

Wastes like ammonia eliminated via diffusion through body wall
Other primitive systems include protonephridia

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14
Q

Asexual reproduction

A

Fission
Regeneration
Budding
Polyembryony

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15
Q

Sexual reproduction

A

Hemaphraditic

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16
Q

Platyhelminthes classification

A

Turbellaria
Monogenea
Trematoda
Cestoda

17
Q

Turbellaria characteristics

A

Free living
Ventral mouth
Locomotion by creeping on cilia and mucous

18
Q

Monogenea characteristics

A

Endoparasites on skin or gills of fish
Simple life cycle
No intermediate host

19
Q

Trematoda characteristics

A

All parasitic
Endoparasitic flukes
Parasite in blood or digestive system
Up to 5 developmental stages in 2 or more hosts

20
Q

Cestoda characteristics

A

All parasitic
Endoparasites in intestines
Bud long chains of proglottids

Biology (12 decks)

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