Cnidarians - Jelly fish Flashcards

1
Q

What are the 4 layers in the diploblastic cnidarian

A

Epidermis
Mesogeal
Gastrodermis
Gastrovascular cavity

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2
Q

How many openings does the cnidarian have

A

1

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3
Q

What are the 2 differences between the polyp stage and the medusa stage

A

The mesoglea is thicker and the gastrovascular cavity is reduced in the medusa stage

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4
Q

Symmetry, blastia and coelom

A

Radial + Diploblastic + Acoelomate

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5
Q

Where are cnidocytes and how do they work

A

On the tentacles of cnidarians
Contain nematocytes and cnidocils
When food is detected the cnidocil triggers the nematocyte which will evert and inject a toxin

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6
Q

Where does digestion occur in cnidarians

A

In the gastrodermal cells in the gastrovascular cavity

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7
Q

How do cniardians move

A

Gastrovascular cavity acts as a hydrostatic skeleton against which contractile cells can work

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8
Q

What do cniardians have instead of a brain

A

Non-centralised nervous net distributed radially

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9
Q

Where does fertilisation take place in cnidarians

A

Externally

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10
Q

Which is the asexual and sexual phase and what does each one produce

A

Sexual - Medusa producing gametes
Asexual - Polyp producing medusae

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11
Q

Give the stages of the cnidarian Obelia

A
  1. Fertilisation to form zygote
  2. Mitotic divisions to form planula larvae that develop into a mature polyp
  3. Budding forms a medusa bud
  4. Medusa bud forms into a adult medusa
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12
Q

Give 1 example for each of the 4 major classes of Cnidarians - Hydrozoan, Scyphozoan, Cubozoan and Anthozoan

A

H - Portuguese man-of-war
S - Sea nettles
C - Box jellies
A - Sea anemones - NOT medusozoan

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13
Q

What is the function of the statocysts

A

Organs of equilibrium that cause muscle contractions to right the Medusa

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14
Q

What is the function of the statocysts

A

Organs of equilibrium that cause muscle contractions to right the Medusa

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