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Biology II > Chapter 33-Noncoelomate and Pseudocoelomate Invertebrates > Flashcards

Chapter 33-Noncoelomate and Pseudocoelomate Invertebrates Flashcards

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1
Q

What is in phyla porifera

A

sponges

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2
Q

What are parazoa

A

Simple animals lacking tissues, most lack a definite symmetry (asymmetric)

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3
Q

Larval sponges

A

Free swimming motile

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4
Q

Adult sponges

A

remain attached-sessile

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5
Q

How does water enter and exit a sponge

A

enters through ostia and exits osculum

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6
Q

What is the mesohyl (middle layer) of a sponge made of

A
  • spicules-needles of calcium carbonate or silica

- spongin-reinforcing tough protein fibers

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7
Q

What are choanocyte

A

they engulf and digest food from passing water

-collar cells-move water through sponge; absorb nutrients

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8
Q

How do sponges asexually reproduce

A

fragmentation-piece breaks off and attaches elsewhere to form new sponge

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9
Q

Describe sexual reproduction in a a sponge

A

Hermaphrodite

  • choanocytes transform into sperm
  • captured and passed to egg cell in mesohyl
  • development can occur in mother or in open water
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10
Q

What layer of a sponge provides protection

A

Mesohyl

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11
Q

What are Eumetazoa

A

All animals except sponges-distinct tissues

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12
Q

what type of symmetry do Cnidaria exhibit

A

Radial symmetry

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13
Q

What are organisms called with only 2 germ layers

A

diploblastic

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14
Q

What are nematocysts

A

stinging cells found on tentacles of cnidarians

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15
Q

What are the 2 forms of Cnidarians

A

Polyps: cylindrical and sessile
Medusa: umbrella-shaped and motile

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16
Q

what does the gastrovascular cavity do for the cnidarian

A

gives it a hydrostatic skeleton to support itself with

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17
Q

What are Anthozoans

A

Cnidaria
sea anemones, corals
-all polyps

18
Q

What are Cubozoa

A

Cnidarians

-box jellies, strong swimmers, fatal stingers

19
Q

What are hydrozoa

A

Cnidarians

  • hydra, portuguese man of war
  • both polyp and medusa forms, has freshwater members
20
Q

What are Syphozoa

A

Cnidarians

  • Jellyfish
  • ring of muscle allows for rhythmic contractions for propulsion
21
Q

What are staurozoa

A

Star jellies

-resembles a medusa in most ways but is attached to substrate

22
Q

Describe Phylum Ctenophora

A

Comb jellies
-radial symmetry
8 rows of fused cilia that beat in coordination
-bioluminescent

23
Q

What do Ctenophores use to capture prey

A

2 tentacles covered with Colloblasts

-discharge strong adhesive used to capture prey

24
Q

How are bilaterians classified

A

by their coelom

  • acoelomates
  • pseudocoelomates
  • coelomates
25
Q

What phylum are flatworms in

A

Platyhelminthes

26
Q

Describe flatworms

A

Ciliated, bilaterally symmetrical, Acoelomates, many are parasitic

27
Q

What do Platyhelminthes lack

A

A circulatory system

-simple diffusion for gas transport

28
Q

what category are tapeworms in

A

Platyhelminthes

29
Q

how do tapeworms absorb their food

A

directly through body walls

30
Q

What do flame cells do for Platyhelminthes

A

help with excretion of fluids and other substances

31
Q

How do platyhelminthes reproduce

A

most are hermaphroditic,
can undergo sexual reproduction
asexual regeneration

32
Q

what are the 2 major groups of flatworms

A

Class Turbellaria-free living
Neodermata-parasitic
-class trematoda-flukes
-class cercomeromorpha-tapeworms

33
Q

What is one of the most important trematode to human health

A

blood flukes

34
Q

How do tapeworms stay in the body

A

hang onto inner wall of host intestine using scolex

35
Q

Describe Phylum Acoelomorpha

A

Have primitive nervous system and lack digestive cavity

-once considered part of platyhelminthes

36
Q

Describe Cycliophora (phylum)

A

Acoelomates

  • live on mouthparts of claw lobsters
  • circular moith surrounded by ring of cilia
37
Q

What does the Pseudocoelomic fluid do

A

performs the fuctions carried out by a circulatory system in most coelomate animals

38
Q

What are in Phylum Nematoda

A

Nonsegmented, round worms

-marine, freshwater, parasites, free-living

39
Q

Nematode characteristics?

A

Bilaterally symmetrical and unsegmented

-Pseudocoelom

40
Q

How do Nematodes reproduce

A

Separate male and female worms

-smaller males have a hooked end

41
Q

Lifestyle of nematodes?

A

Many are active hunters

-others are parasites of plants and animals

42
Q

What are in Phylum Rotifera

A

Bilaterally symmetrical, unsegmented pseudocoelomates

  • highly developed internal organs
  • conspicuous ring of cilia at anterior end used for locomotion and sweeping food into mouth

Biology II (28 decks)

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