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Zoology, LEC 142 > Week 6: Lecture 4: Acoelomate Invertebrates, Cnidarians And Flatworms > Flashcards

Week 6: Lecture 4: Acoelomate Invertebrates, Cnidarians And Flatworms Flashcards

1
Q

Two cell layers in acoelomates

A

Epidermis

Gastrodermis

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2
Q

Phylum cnidaria

Includes

A

Includes jellyfish, anemones and corals

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3
Q

Two body forms of phylum cnidaria

A

Sessile polyps and mobile medusae

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4
Q

Medusa

Type of reproduction

A

Sexual reproduction

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5
Q

Polyp

Type or reproduction

A

Asexual reproduction,

Ova and sperm released into the water en-mass

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6
Q

Characteristic of the phylum cnidaria

A

Stinging

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7
Q

Cnidocytes

A

Stinging cells

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8
Q

Three classes in the Cnidaria phylum

A

Hydra
Jellyfish
Sea anemones and coral

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9
Q

Where do coral reefs form

A

Shallow, clear water near the equator and live in a narrow temp range of 22-23 degrees C

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10
Q

Phylum Platyhelminthes

A

Flat worms, flukes and tapeworms

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11
Q

Flatworms are

A

Free living aquatic

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12
Q

Flukes and tapeworms are

A

Parasitic

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13
Q

Symmetry of Phylum Platyhelminthes

A

Bilateral symmetry

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14
Q

Are the phylum Platyhelminthes acoelomates

A

Yes

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15
Q

How does the phylum Platyhelminthes respire and excrete

A

Through the skin

Which is very thin

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16
Q

Possible advantages of infecting secondary and tertiary hosts?
(Parasites)

A
  • Increased reproductive potential
    • Increased range of the parasite in space and time
    • Intermediate host can promote infection of definitive host
17
Q

Pre-adaptation

A

Character which serves a different purpose from the one for which it is evolved.

18
Q

Four adaptations/ pre-adaptations for a parasitic life

A
  • small, flat or cylindrical (pre-adaptation)
    * reduced sense organs
    * attachment organs
    * anaerobic respiration
19
Q

What are stinging cells used for

A

Catching prey

20
Q

Are stinging cells (cnidocytes) unique to cnidarians?

A

Yes

Zoology, LEC 142 (10 decks)

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