Phylum Cnidaria: The Hydroids, Jellyfishes, Anemones, And Corals.
The phylum Cnidaria covering Hydra, Obelia, Gnionemus, Physalia, Aurelia, Matridium, Meandrina, Metridium, Gorgonia, Tubipore.
Questions and Answers
- 1.
Cnidarians are eumetazoan.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Cnidarians are classified as eumetazoans because they are multicellular organisms with specialized tissues and organs. Eumetazoans are a subphylum of animals that includes all animals except sponges. Cnidarians, such as jellyfish and corals, have distinct tissues, including nerve cells and muscle cells, which allow them to exhibit more complex behaviors than organisms without tissues. Therefore, the statement that cnidarians are eumetazoans is true.Rate this question:
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- 2.
The hydroids, jellyfish, and anemones that belong to this group all have a basic body plan that exhibits _________?
- A.
Bilateral Symmetry
- B.
Radial Symmetry
- C.
TopsyTurvy Semmetry
Correct Answer
B. Radial SymmetryExplanation
The correct answer is radial symmetry. This group of organisms, including hydroids, jellyfish, and anemones, all have a body plan that is arranged around a central axis, with body parts radiating outwards from the center. This allows them to be equally symmetrical from any point on their body, enabling them to interact with their environment in all directions.Rate this question:
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- 3.
If something is diploblastic, this means it is derived from what?
- A.
One tissue layer.
- B.
Two tissue layers.
- C.
Three tissue layers.
Correct Answer
B. Two tissue layers.Explanation
The term "diploblastic" refers to organisms that have two tissue layers: the ectoderm and the endoderm. These tissue layers are found in animals like jellyfish and sea anemones. The ectoderm forms the outer layer of the organism, while the endoderm forms the inner layer. These two layers give rise to various structures and organs in the organism.Rate this question:
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- 4.
What are sessile forms that are cylindrical, with the mouth found on the upper side and tentacles extending upward.
Correct Answer
Polyps
PolypExplanation
Polyps are sessile forms that are cylindrical in shape, with their mouth located on the upper side and tentacles extending upward. They are typically found in aquatic environments, such as coral reefs. Polyps are commonly seen in cnidarians, such as corals and sea anemones. These organisms use their tentacles to capture prey and bring it towards their mouth for consumption. The presence of both "Polyps" and "Polyp" in the answer suggests that either term can be used to describe this specific type of organism.Rate this question:
- 5.
What are umbrella shaped forms that have the mouth located on the lower side and thd tentacles extending down?
Correct Answer
MedusaExplanation
Medusa is the correct answer because it accurately describes umbrella-shaped forms with the mouth on the lower side and tentacles extending downwards. Medusas are a type of cnidarians, specifically jellyfish, which have a distinctive bell-shaped body with tentacles hanging down from the lower side. This characteristic shape and arrangement of body parts make Medusa the appropriate answer to the question.Rate this question:
- 6.
The epidermis is the _____________?
- A.
External Covering
- B.
Internal Covering
- C.
The tentacles
Correct Answer
A. External CoveringExplanation
The epidermis is the external covering of the body. It is the outermost layer of the skin and provides protection against the external environment. It acts as a barrier, preventing the entry of harmful substances and microorganisms into the body. The epidermis also helps in regulating body temperature and preventing excessive water loss.Rate this question:
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- 7.
A layer of gelatinous material, ______________, is found between the internal and external layers and gives this group their soft, jelly-like feel.
Correct Answer
mesogleaExplanation
The correct answer is "mesoglea." Mesoglea refers to a layer of gelatinous material found between the internal and external layers of certain organisms. This layer is responsible for giving these organisms their soft and jelly-like feel.Rate this question:
- 8.
The stinging cells are called __________?
Correct Answer
cnidocytesExplanation
The stinging cells found in certain organisms are known as cnidocytes. These specialized cells contain nematocysts, which are capsule-like structures that contain venomous threads. When triggered, the cnidocytes shoot out these threads, allowing the organism to capture prey or defend itself from potential threats. Cnidocytes are particularly prominent in cnidarians, such as jellyfish and sea anemones.Rate this question:
- 9.
Cnidocytes contain structures called ____________ that are capable of injecting neurotoxins.
Correct Answer
nematocystsExplanation
Cnidocytes are specialized cells found in cnidarians, such as jellyfish and sea anemones. These cells contain structures called nematocysts, which are like tiny harpoons that can be discharged to inject neurotoxins into their prey or predators. Nematocysts are essential for capturing food and defense, as the neurotoxins they inject can paralyze or kill the target. Therefore, the correct answer is nematocysts.Rate this question:
- 10.
The genus Hydra is part of what class?
Correct Answer
HydrozoaExplanation
The correct answer is Hydrozoa because the question asks about the class to which the genus Hydra belongs. Hydra is a genus of small, simple aquatic animals that belong to the class Hydrozoa. This class includes a variety of organisms, such as jellyfish and other cnidarians, that typically have a complex life cycle involving both a polyp and a medusa stage. Therefore, Hydra being part of the class Hydrozoa is the correct answer.Rate this question:
- 11.
The genus Obelia is part of what class?
Correct Answer
HydrozoaExplanation
The correct answer is Hydrozoa because the question asks about the class that the genus Obelia belongs to. Obelia is a type of hydrozoan, which is a class of small, predatory marine animals that are commonly found in both freshwater and saltwater environments. Hydrozoa is characterized by its unique life cycle, which includes both a polyp and a medusa stage.Rate this question:
- 12.
Genus Gonionemus is part of what class?
Correct Answer
HydrozoaExplanation
Genus Gonionemus belongs to the class Hydrozoa. Hydrozoa is a class of small, predatory animals that are mostly marine. They are characterized by their unique life cycle, which includes both a polyp and a medusa stage. Genus Gonionemus specifically refers to a genus of hydrozoans that are commonly known as sea nettles. Sea nettles are jellyfish-like creatures that have long, stinging tentacles and are found in coastal waters. Therefore, the correct answer is Hydrozoa.Rate this question:
- 13.
Genus Physalia is part of what class?
Correct Answer
HydrozoaExplanation
Physalia is a genus of marine organisms commonly known as Portuguese man o' war. These organisms are classified under the class Hydrozoa, which includes various other species of cnidarians. Hydrozoa is a class of small, predatory animals that are mostly marine and exhibit both polyp and medusa stages in their life cycle. Physalia, being a member of this class, shares similar characteristics and life cycle patterns with other Hydrozoa species. Therefore, the correct answer is Hydrozoa.Rate this question:
- 14.
Genus Aurelia is part of what class?
Correct Answer
ScyphozoaExplanation
Genus Aurelia is part of the class Scyphozoa. Scyphozoa is a class of marine animals commonly known as true jellyfish. They are characterized by their gelatinous bodies and tentacles. Genus Aurelia specifically refers to a genus of jellyfish within the class Scyphozoa. This classification is based on their anatomical and physiological features, as well as their reproductive methods.Rate this question:
- 15.
Genus Metridium is part of what class?
Correct Answer
AnthozoaExplanation
Genus Metridium is part of the class Anthozoa. Anthozoa is a class of marine animals that includes the largest group of cnidarians, commonly known as sea anemones and corals. Genus Metridium specifically refers to a type of sea anemone. Therefore, it is correct to say that Genus Metridium belongs to the class Anthozoa.Rate this question:
- 16.
Genus Meandrina is part of what class?
Correct Answer
AnthozoaExplanation
Meandrina is a genus of coral, and corals belong to the class Anthozoa. Anthozoa is a class of marine invertebrates that includes all the true corals, sea anemones, and sea pens. Therefore, it is correct to say that the genus Meandrina is part of the class Anthozoa.Rate this question:
- 17.
Genus Gorgonia is part of what class?
Correct Answer
AnthozoaExplanation
Genus Gorgonia belongs to the class Anthozoa. Anthozoa is a class of marine invertebrates that includes the largest group of cnidarians, commonly known as corals and sea anemones. Gorgonia is a genus within this class, comprising a variety of colonial soft corals found in tropical and subtropical oceans. These corals have a branching or fan-like appearance and are known for their vibrant colors. Therefore, Anthozoa is the correct class for Genus Gorgonia.Rate this question:
- 18.
Genus Tubipora is part of what class?
Correct Answer
AnthozoaExplanation
Genus Tubipora belongs to the class Anthozoa. Anthozoa is a class of marine invertebrates that includes the largest group of animals within the phylum Cnidaria, which also includes jellyfish and sea anemones. Tubipora is a genus of colonial coral that forms tube-like structures, and it falls under the class Anthozoa because it shares common characteristics and traits with other members of this class.Rate this question:
- 19.
What is the genus of this image?
Correct Answer
TubiporaExplanation
The genus of the image is Tubipora.Rate this question:
- 20.
What is the genus of the species in this image?
Correct Answer
GorgoniaExplanation
Notice it is more stringy less clustered/tube like than Tubipora.Rate this question:
- 21.
What is the genus of the species in this image?
Correct Answer
MeandrinaExplanation
The genus of the species in the image is Meandrina.Rate this question:
- 22.
What is the genus of this species?
Correct Answer
MetridiumExplanation
The genus of this species is Metridium.Rate this question:
- 23.
What is the genus name of the specimen in this image?
Correct Answer
AureliaExplanation
The genus name of the specimen in the image is Aurelia.Rate this question:
- 24.
What is the genus name of this specimen?
Correct Answer
PhysaliaExplanation
The genus name of this specimen is Physalia.Rate this question:
- 25.
What is the genus name of this specimen?
Correct Answer
GonionemusExplanation
The correct answer is "Gonionemus". This is the genus name of the specimen in question.Rate this question:
- 26.
What is the genus name of this specimen?
Correct Answer
HydraExplanation
The genus name of this specimen is Hydra.Rate this question:
- 27.
What is the genus name of this specimen?
Correct Answer
TubiporaExplanation
The genus name of this specimen is Tubipora.Rate this question:
- 28.
What is the pointer pointing at?
Correct Answer
Oral Arm - 29.
Fill in the blank white spot on the image.. what is this called?
Correct Answer
VelumExplanation
The correct answer is "Velum." The velum is a soft tissue located at the back of the throat, also known as the soft palate. It plays a crucial role in speech and swallowing by closing off the nasal passage during swallowing and opening it during speech. The velum helps to prevent food and liquid from entering the nasal cavity and allows air to pass through the nose during speech sounds like "m" and "n."Rate this question:
- 30.
What is the genus name of this specimen?
Correct Answer
ObeliaExplanation
The genus name of this specimen is Obelia.Rate this question:
- 31.
In order : Gastrovascular cavity, epidermis, mesoglea, gastrodermis. List the corresponding letters in order of the listed names.
- A.
B, A, C, D
- B.
C, A, D, B
- C.
D, C, A, B
- D.
C, A, B, D
Correct Answer
B. C, A, D, BExplanation
The correct order of the listed names is C, A, D, B. The gastrovascular cavity is the first layer, followed by the epidermis, then the gastrodermis, and finally the mesoglea.Rate this question:
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Mar 20, 2023Quiz Edited by
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Feb 19, 2011Quiz Created by
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