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WorksheetsPhylum Cnidaria
Total questions: 20
Worksheet time: 11mins
What class does the common jellyfish belong to?
Class Anthozoa
Class Hydrazoa
Class Scyphozoa
Class Cubozoa
What class does the sea wasp belong to?
Class Hydrazoa
Class Cubozoa
Class Anthozoa
Class Scyphozoa
How many cell layers do cnidarians have?
0
1
2
3
What is the "hollow gut" of a cnidarian?
polyp
gastrovascular cavity
mesoglea
cnidocyte
True or False: Cnidarians do not have a central nervous system.
True
False
How do cnidarians absorb oxygen from the water and expel carbon dioxide?
Through their tentacles
Through diffusion
By using their nematocysts
By using their respiratory organs
How are nervous responses in cnidarians controlled?
by their gastrovascular cavity
through the mesoglea
by the nerve net
through the filaments in their nematocysts
Through what 2 parts of a cnidarian's body do oxygen and carbon dioxide enter and exit?
through its lungs and their gills
through the nerve net and the gastrovascular cavity
through its cnidocytes and their surface cells
through the gastrovascular cavity and surface cells
How do cnidarians reproduce?
only sexually
only asexually
both sexually and asexually
genetically reproduced in labs
How do medusae generally reproduce?
Adult medusae release their eggs and sperm in the water where fertilization occurs, creating a zygote.
The eggs of a medusa are fertilized inside its body and the medusa gives live birth.
The medusa self-fertilizes and the medusa lays shelled eggs
The medusa reproduces through binary fission.
True or False: All cnidarians are sessile.
True
False
How do medusae move?
by opening and closing their gastrovascular cavity
by swimming and expelling water jets through contracting their bodies
by alternating contact points on the substrate and performing somersaults
They don't move. Medusae always remain sessile.
Which part of a cnidarian's body is waste dispelled from?
the gastrodermis
the tentacles
the mesoglea
the gastrovascular cavity
Based on their diet, cnidarians are _____.
herbivores
omnivores
carnivores
photosynthetic
What part of a cnidarian's body allows them to capture/kill their prey?
the epidermis
the polyp
the nematocysts
the nerve net
What type of symmetry do cnidarians demonstrate?
Bilateral symmetry
Radial symmetry
What life stage follows directly after the planula stage?
the zygote stage
the young medusa stage
the bastula stage
the polyp stage
True or False: Cnidarians generally undergo two life stages: a polyp stage and a medusa stage
True
False
What body type does this cnidarian possess?
Polyp
Medusa
What body type does this cnidarian posses?
Polyp
Medusa
