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Mollusca

sophie waddington 13 preguntas

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Preguntas del test (13)

  1. 1Mollusca
    - animals with 2, 1 or no [blank_start]shells[blank_end]
    - protostomes (show [blank_start]spiral[blank_end] cleavage)
    - lophotrochozoans = the most [blank_start]complex[blank_end]
    - 'mollis' = [blank_start]soft[blank_end]
    - 100,000 species > the second largest phyla to [blank_start]arthropods[blank_end]
    - all share same basic body plans but there are dramatic modifications
    1. Ashells
    2. Bspiral
    3. Ccomplex
    4. Dsoft
    5. Earthropods
  2. 2Mollusc body structure
    - 3 major components: [blank_start]muscular[blank_end] foot, mantle and the [blank_start]visceral[blank_end] mass
    - the visceral mass holds the internal [blank_start]organs[blank_end]
    - mantle secretes the [blank_start]shell[blank_end] which is made of [blank_start]calcium[blank_end] carbonate
    - the bodies are not segmented
    - breathe via gills called [blank_start]ctenidia[blank_end] which look like combs
    - ctenidia hang in the [blank_start]mantle[blank_end] cavity
    - toothed structure called the [blank_start]radula[blank_end]: all classes bar bivalvia have a radula
    - the [blank_start]mantle[blank_end] is a fold/cloak of tissue covering the visceral mass
    - water flows over the ctenidia
    - oxgyen is transported in blood circulated by the [blank_start]heart[blank_end] > blood partly flows in vessels and in a blood filled cavity called the [blank_start]haemocoel[blank_end]
    - heart, digestive, excretory and reproductive organs are all in the central visceral [blank_start]mass[blank_end]
    - gastropods and cephalopods all have very well developed [blank_start]nervous[blank_end] systems
    1. Avisceral
    2. Bmuscular
    3. Corgans
    4. Dcalcium
    5. Eshell
    6. Fctenidia
    7. Gmantle
    8. Hradula
    9. Imantle
    10. Jheart
    11. Khaemocoel
    12. Lmass
    13. Mnervous
  3. 3Molluscs are mostly [blank_start]marine[blank_end], they start life as [blank_start]planktonic[blank_end] larvae (primitive trochophore larvae) and then develop and change shape into [blank_start]veliger[blank_end] larvae
    1. Amarine
    2. Bplanktonic
    3. Cveliger
  4. 4Which are classes of molluscs
    1. Agastropoda
    2. Bbivalvia
    3. Ccephalopoda
    4. Dpolyplacophora
    5. Eplatyhelminthes
    6. Frotifera
    7. Gbryozoa
    8. Hbrachiopoda
  5. 5Bivalvia are the largest class of mollusca
    1. AVerdadero
    2. BFalso
  6. 6[blank_start]Polyplacophora[blank_end]
    - chitons in english
    - means many [blank_start]shells[blank_end]
    - lots of [blank_start]ctenidia[blank_end] (gills)
    - [blank_start]8[blank_end] overlapping shells > but not segmented
    - marine herbivores > scrape algae from rocks using [blank_start]radula[blank_end]
    - mostly intertidal
    - adults spend most of their life firmly attached to rocks by the muscular [blank_start]foot[blank_end]
    - seperate sexes
    - usually fertilise in water
    - some brood young larvae
    1. APolyplacophora
    2. Bshells
    3. Cctenidia
    4. D8
    5. Eradula
    6. Ffoot
  7. 7[blank_start]Gastropoda[blank_end]
    - means [blank_start]stomach[blank_end] food > includes animals which crawl on their stomach
    - largest class of mollusca
    - slugs, [blank_start]snails[blank_end], limpets
    - most diverse and widespread class
    - all gastropods go through [blank_start]torsion[blank_end] in development = 180 degree turn of the [blank_start]visceral[blank_end] mass, unknown exactly as to why this happens, thought maybe to protect [blank_start]head[blank_end] as can draw head in or to prevent sediment filling the mantle cavity when moving
    - shell can often be spiral or lost completely
    - some sea [blank_start]slugs[blank_end] (nudibranchs) are camouflaged or are [blank_start]aposematic[blank_end] = coloured to warn predators
    - sea slugs are more suseptible to predation due to absence of shell > some contain toxins, others eat cnidarians and use [blank_start]cnidocytes[blank_end] for protection
    - most move by gliding with foots > can also swim or gallop
    - [blank_start]radula[blank_end] often scraper can be modified in predatory gastropods
    1. AGastropoda
    2. Bstomach
    3. Csnails
    4. Dtorsion
    5. Evisceral
    6. Fhead
    7. Gslugs
    8. Haposematic
    9. Icnidocytes
    10. Jradula
  8. 8Gastropoda cont.
    - only mollusc class with truly terrestrial members who breathe via a [blank_start]vascularised[blank_end] lung
    - shell morphologies in gastropods are highly variable
    - some [blank_start]nudibranchs[blank_end] (sea slugs) have a left and right side however the [blank_start]torsion[blank_end] of the visceral is visible due to the absence of the shell
    1. Avascularised
    2. Bnudibranchs
    3. Ctorsion
  9. 9Radula in Gastropods
    - radula = normally used to [blank_start]scrape[blank_end] substrate
    - it is a [blank_start]sand[blank_end] paper structure over a hard structure called [blank_start]odontophore[blank_end] various [blank_start]muscles[blank_end] move the radula to scrape along the substrate
    - with SEM you can seen microscopic [blank_start]teeth[blank_end] on the radula
    - modified radula e.g [blank_start]cone[blank_end] snail > radula is a needle used to inject venom into prey, specialised carnivore, genus found in tropics and subtropical regions
    1. Ascrape
    2. Bsand
    3. Codontophore
    4. Dmuscles
    5. Eteeth
    6. Fcone
  10. 10[blank_start]Bivalvia[blank_end] = the only class of mollusca that does not have a radula
    - 'two shells'
    - [blank_start]mussels[blank_end], oysters, clams, scallops
    - marine and [blank_start]fresh[blank_end] water
    - hinger shell extends over the sides and top of body
    - sometimes the shell might be [blank_start]asymmetrical[blank_end] = one side is bigger
    - [blank_start]small[blank_end] head
    - no [blank_start]radula[blank_end] as they don't scrape their food
    1. ABivalvia
    2. Bmussels
    3. Cfresh
    4. Dasymmetrical
    5. Esmall
    6. Fradula

Información

Descripción
Animal Kingdom Test sobre Mollusca, creado por sophie waddington el 16/04/2018.
Idioma
English
Visitas
2
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