Easy
What are Cnidarians?
Cnadarians are a group of simple,radialy symmetrical animals that include jellyfish,corals,and anemones
Give three examples of Cnidarians?
Jellyfish,Corals,sea anemones
What is the main feature of cnidarians?
They have cindocytes,specialized cell that contain nematocysts(stinging cells).
What are the two body forms of cnidarians?
They are polyp (sessile) and the medusa (free-swimming).
What is a polyp in cnidarians?
A polyp is a clindrical,sessile form of cnidarian,typically attached to a surface,such as in sea anemones and corals
What is medusa in cnidarians?
A medusa is a free-swimming,bell-shaped form of a cnidarian,such as jellyfish
What are the four main classes of cnidarians?
Hydrozoa, Scyphozoa, Cubozoa, and Anthozoa.
What are some examples of Anthozoa?
Acropora (staghorn coral), Actinia (sea anemones), Fungia (mushroom coral).
What is budding in cnidarians?
A form of asexual reproduction where a new individual grows from the parent and detaches.
What is the function of cnidocytes in cnidarians?
Cnidocytes contain nematocysts, which inject venom into prey or predators for defense and feeding.
Which class of cnidarians includes corals and sea anemones?
Anthozoa
Why are coral reefs important to marine ecosystems?
They provide habitat, food, and protection for many marine species.
What characteristic makes cnidarians unique from other animals?
They have stinging cells called cnidocytes, which contain nematocysts to capture prey.
What is the relationship between corals and zooxanthellae?
Corals have a symbiotic relationship with zooxanthellae (photosynthetic algae), which provide them with nutrients.
How do jellyfish move?
By pulsating their bell and drifting with ocean currents.
How do cnidarians reproduce asexually?
By budding, where a small polyp grows out of the parent and eventually detaches.
What are some examples of Cubozoa?
• Chironex fleckeri (Australian box jellyfish), Carukia barnesi (Irukandji jellyfish).
What are some examples of Scyphozoa?
Aurelia aurita (moon jellyfish), Cyanea capillata (lion’s mane jellyfish).
How do cnidarians reproduce sexually?
Medusae release sperm and eggs, which combine to form a planula larva.
What are some examples of Hydrozoa?
Hydra, Obelia, Physalia physalis (Portuguese man-of-war).
What is mesoglea in cnidarians?
Mesoglea is the jelly-like layer between the outer and inner tissues of cnidarians, providing support.
How do cnidarians capture and digest their food?
They use tentacles with cnidocytes to stun prey, then move it into the gastrovascular cavity for digestion.
What is a planula larva?
A free-swimming, ciliated larva that settles and develops into a polyp.
What type of symmetry do cnidarians have?
Radial symmetry, meaning their body is arranged around a central axis.
Which body form of cnidarians is responsible for sexual reproduction?
The medusa stage is responsible for sexual reproduction.