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What are Sea Pens?

Sea pens are marine cnidarians that have a soft cylindrical body with a feathery, brightly colored polyp at one end. They are named for their resemblance to old-fashioned quill pens. Sea pens are typically found in deep-sea environments and are filter feeders, using their polyps to capture plankton from the water.


Do cnidarians live in salt water?

They mostly live in salt water, but a few species live in freshwater ponds and lakes.


What are the organisms that live in colonies of polyps and secrete an exoskeleton of calcium carbonate?

Corals are organisms that live in colonies of polyps and secrete an exoskeleton of calcium carbonate. These structures form the framework of coral reefs, providing habitat for a diverse array of marine life.


Are corals flowering marine plants?

Coral are marine animals that typically fall in the Anthozoa class. All corals have tubular bodies called polyps with a ring of stinging tentacles around the mouth. When the animal dies, the polyps harden and may become part of a coral reef.


Explain the symbiotic relationship between coral polyp and algae?

It's a mutualistic symbiosis, and occours in corals, jellyfishes and other polyps.* The symbionts, called zoochlorellae if they are green algae or zooxanthellae if they are protozoans, with photosynthesis produce: # Sugars, wich can feed the host up to 90% of its energy request. # Oxygen. * The cnidarian (coral, jellyfish or hydropolyp) gives to zoochlorellae (or to zooxanthellae) his products of waste: # CO2 (which decreasing helps hermatypic corals forming their skeletons) # Minerals. # Nitrogen. In order to perform photosynthesis, zoochlorellae and zooxanthellae need light, so they can stay only in shallow waters.

Related Questions

What are the two forms of cnidarians?

Cnidarians come in two forms: a medusa has tentacles that hang down and polyps usually live attached to a surface.


What is a coral polyps habitat?

Where do polyps live


What kind of environment the cnidarians are living?

Cnidarians live in water.


Where in the sea do cnidarians live?

the cnidarians live at the bottom of the sea ------- and the top of the sea, and everywhere in between...


Do cnidarians lay eggs or give birth to live young?

yes cnidarians lay eggs


Where do cnidarians digest their food?

Hmmm, Mrs Perry's class I see. It occurs in the gastrovascular cavity.


What are Sea Pens?

Sea pens are marine cnidarians that have a soft cylindrical body with a feathery, brightly colored polyp at one end. They are named for their resemblance to old-fashioned quill pens. Sea pens are typically found in deep-sea environments and are filter feeders, using their polyps to capture plankton from the water.


Why do cnidarians live underwater?

because none of them can breath air


How do cnidarians give birth?

Sponges and cnidarians commonly reproduce asexually by budding


What cnidarians live in fresh water?

because none of them can breath air


Does a polyp live close to a surface under water?

Yes, polyps typically live close to the surface of the water on the ocean floor or on rocks in coral reefs. They use their tentacles to capture food particles from passing water.


Do cnidarians live in salt water?

They mostly live in salt water, but a few species live in freshwater ponds and lakes.