Cnidarians

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 do cnidarians reproduce?

• only sexually

• only asexually

• both sexually and asexually

• genetically reproduced in labs

Tags

NGSS.MS-LS3-2

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.

Tags

NGSS.MS-LS3-2

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.

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