Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Animal diversity > The jellies > Flashcards

The jellies Flashcards

1
Q

what is meant by the term Radiata

A

animals with radial symmetry

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what is the phylum Cnidaria

A

marine diploblastic species which possess a gastrovascular cavity and have two basic body plans

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

give an example of species in the phylum Cnidaria

A

hydra
jellyfish
sea anemones
corals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what are the two basic body plans of cnidaria

A

1) polyp
2) medusa

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

outline the differences between the polyp and medusa body plans

A

1) sessile with an oral end direct upwards with mouth and tentacles for prey capture = asexual

2) free-living with a bell shape with an oral end concave pointed down and tentacles which hang from it = sexual

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

where are the medusoid forms found

A

in all cnidarian classes exepct anthoza

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what are the stinging cells called in cnidarians

A

cnidocytes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

outline how cnidocyte cells work

A

contain a trigger mechanisms called a nematocysts which contains along thread within a capsule which when discharged is thrown out and penetrate prey and release a toxin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

outline how cnidaria can move

A

a fluid filled gastrovascular cavity can be used as a hydrostatic skeleton allowing simple movement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what are the different classes of the cnidaria phylum

A

1) hydrozoa
2) scyphozoa
3) cubozoa
4) staurozoa
5) anthozoa

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what are the 2 genera of pleustonic hydroids

A

1) porpita
2) velella

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what are siphonophores

A

1 order of hydrozoa = are colonies of medusoid individuals which float and swim, they drift beneath the surface e.g. portugaese man of war

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

outline the symbiotic relationship between hermit crabs and hydroza

A

hydrozoa lives on the shell of the grab providing protection using the stinging cells, in return the crab removes debris and moves fresh water over it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

outline some characteristics of the class of jellyfish, scyphozoa

A

polyp stage as a larval form
body composed of translucent mesoglea with tentacles haing from bell margin
oral arms= 4 manubruim
no velum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

outline sexual reproduction in scyphozoa

A

1) planula larvae develop after fertilisation
2) they settle as scyphistoma at the ocean floor
3) they feed and produce more scyphistome by budding
4) produce young jellyfish medusae by budding off at oral end and stacking in plates
5) released as young jelly fish

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what is strobilation

A

the process which releases strobila (stacked jellyfish medusae) as young jellyfish, ephyra

17
Q

outline the characteristics of box jellyfish

A

tranverse section the bell is square with tentacles at each corner
scyphistoma dont produce strovila
- strong swimmers
- predators
- lethal to humans

18
Q

what does positively photoactic mean

A

move towards the light e.g. cubozoa jellyfish

19
Q

outline the characteristic of the class staurozoa

A

stalked jellfish which dont alternate between polyp and medusa life cycles
the medusa is attached
found in colder waters

20
Q

outline the characteristics of the class anthozoa

A

no medusae life cycle
all marine
poylps contracticle
= corals and anemones

21
Q

what are the three subclasses of anthozoa

A

1) octocorallia - polyps have 8 pinnate tentacles some have sclerites
2) hexacorallia = 12 tentacles in 2 cycles and not pinnate
3) ceriantipatharia

22
Q

how do anemones reproduce asexually

A

1) pedal laceration
2) fragmentation
3) longitudinal fission

23
Q

what causes coral bleaching

A
  • increasing water temp
  • starvation
  • changes in salinity
  • changes in solar irradiance
24
Q

what are the two classes in the phylum ctenophora

A

1) tentaculata
2) nuda

25
Q

what is the key differences between ctenophora and cnidaria

A

instead of stinging cells they have adhesive cells called colloblasts
bioluminescence

26
Q

what is cephalisation

A

an evolutionary trend towards developing sensory structures at the anterior end (the head)

27
Q

what is the difference between radiata and bilateria

A

radiata= two germ cell layers (diploblastic)
bi = three germ layers (triploblastic)

28
Q

what is an acoelomate

A

translates to without hollow
the area is filled with mesoderm cells so no true cavity

29
Q

what are the two phyla of acoelomates

A

1) nemertea
2) platyhelminthes

30
Q

outline the characteristics of nemertea phyla

A
  • ribbon worms
  • free living
  • dorsoventrally flattened
  • complete digestive tract with mouth and anus
31
Q

outline the characteristics of the phylum platelminthes

A

flatworms
- body dorsoventrally flattened
- gas exchange via diffusion
- no circulatory organs

32
Q

what is a protonephridium

A

a simple tubular excretory system

Animal diversity (13 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions