Quiz 1 - Cnidaria

Question 1

what are the classes of cnidarians? (5 classes total)

High in the Sky their a Cute Star named Anthony

Answer 1

Anthozoa (basal)

Medusozoa: Scyphozoa, Cubozoa, Staurozoa, Hydrozoa

Question 2

what are the two early ediacaran cnidarian fossils called that show the disc-like impression

Answer 2

cyclomedusa + minbia occlusal (twiktya dics)

Question 3

the eoropita fossil looked somewhat like what…

Answer 3

a scyphozoan jellyfish

Question 4

what did the ediacara flindersi resmeble?

Answer 4

anthzoan (sea anemone)

Question 5

what fossil looked like a sea pen but is not a cnidairan because it actually a rangeomorph and they are very different from cnidarians

Answer 5

rangea

Question 6

what is the possible living cnidarian fossil called?

Answer 6

dendrogramma

Question 7

what are some key transitions of cnidarians

Answer 7

radial symmetry
tissue level
incomplete gastrolation
diploblasts
no segmentation

Question 8

what are the two body forms

Answer 8

polyp and medusa

Question 9

what is the bell shape cnidarians form

Answer 9

medusa

more pelagic

Question 10

what is the polyp form look like

Answer 10

tentacles facing upwards, mouth in centre
divided gastrovas cavity
more benthic

Question 11

cnidarians only have one opening (mouth only, no anus) so they have…

Answer 11

incomplete gastrolation

everything the eat goes in the mouth and comes out the mouth

maybe reason for large gastrovas cavity space

Question 12

are cnidarian tentacles fluid filled or solid?

Answer 12

solid

Question 13

what is the cnidarian function for tentacles

Answer 13

capture prey + bring food to mouth

Question 14

what are three layered tissues of cnidarians

Answer 14

outer epidermis
inner laye
mesoglea

Question 15

where does the outer epidermal layer come from

Answer 15

ectoderm, lines the outside of the cnidarian

Question 16

where does the inner tissue layer come from?

Answer 16

embryonic endoderm

- lines inside of stomach + radiating canals inside body

Question 17

what two layers are actual true tissues / cellular

Answer 17

outer epidermis + inner layer - makes the cnidarians diploblastic

Question 18

what is non cellular layer called

Answer 18

mesoglea

Question 19

what are the stinging cells called

Answer 19

cnidocyte

Question 20

what two important organelles to the cnidocytes contain

Answer 20

cnidae = nematocyst

cnidocil - hair trigger

Question 21

what is the most distinguishing feature of the cnidarians?

Answer 21

the cnidocytes!! separated from the rest!

Question 22

how are stinging cells fired?

Answer 22

chemical or physical stimulus triggers cnidocyte - very rapid

cnidae can come in 30+ forms