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Aquatic Invertebrate Phyla Basics
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Aquatic Invertebrate Phyla Basics
Aquatic Invertebrate Phyla Basics
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1
Question
Which phylum of aquatic invertebrates is characterized by pore-bearing bodies and filter feeding?
Answer
Porifera
2
Question
What are the three main types of canal systems in sponges?
Answer
Asconoid, Syconoid, Leuconoid
3
Question
In Porifera, water enters the body through what structures?
Answer
Ostia
4
Question
What tissue organization is found in Porifera?
Answer
Cellular, no true tissues
5
Question
Which structure in a sponge is lined with choanocytes and aids in water flow?
Answer
Spongocoel
6
Question
What type of symmetry do cnidarians generally exhibit?
Answer
Radial or biradial
7
Question
What specialized cells do cnidarians use to capture prey?
Answer
Cnidocytes
8
Question
The gastrovascular cavity in cnidarians serves what functions?
Answer
Digestion and circulation
9
Question
Which cnidarian class is known as the 'true jellyfish'?
Answer
Scyphozoa
10
Question
What distinguishes Cubozoa from other cnidarians?
Answer
Cube-shaped medusa and strong venom
11
Question
What is the primary movement aid in ctenophores?
Answer
Comb plates (cilia rows)
12
Question
Are ctenophores diploblastic or triploblastic?
Answer
Diploblastic
13
Question
What is the typical habitat of the aquatic invertebrate phyla discussed?
Answer
Marine and freshwater environments
14
Question
Which class of Porifera has skeletons made of silica spicules and is often vase-shaped?
Answer
Hexactinellida (Glass Sponges)
15
Question
What is a key feature of Demospongiae?
Answer
Skeleton of spongin fibers or silica
16
Question
What are the two main life stages of Hydrozoa?
Answer
Polyp and medusa
17
Question
Which cnidarian form is usually sessile and cylindrical?
Answer
Polyp
18
Question
Which cnidarian form is free-swimming and bell-shaped?
Answer
Medusa
19
Question
What is a defining characteristic of Anthozoa?
Answer
Only polyps, no medusa stage
20
Question
What makes Box jellies (Cubozoa) particularly dangerous?
Answer
Strong venom and complex eyes
21
Question
Which features are present in the nervous system of cnidarians?
Answer
Nerve net, no centralized brain
22
Question
What type of symmetry do ctenophores exhibit?
Answer
Biradial symmetry
23
Question
What is the main feeding mechanism of ctenophores?
Answer
Ciliated comb rows and tentacles with colloblasts
24
Question
What is an example of a ctenophore species?
Answer
Mnemiopsis leidyi
25
Question
In sponge water canal systems, which system has many chambers and is most complex?
Answer
Leuconoid
26
Question
Which cell type in cnidarians is responsible for venom delivery?
Answer
Cnidocyte
27
Question
What is the structure called that contains a stinging harpoon in cnidocytes?
Answer
Nematocyst
28
Question
During nematocyst firing, what part opens to release the thread?
Answer
Operculum
29
Question
Which cnidarian class has members that build coral reefs?
Answer
Anthozoa
30
Question
What is the primary reproductive strategy of sponges when conditions are stable?
Answer
Asexual reproduction (fragmentation, budding, gemmules)