Sponges, Cnidarians and Flatworms

Which of these organisms is an invertebrate?

• Dolphin

• Slug

• Trout

• Frog

Like cnidarians, which of these organisms exhibits radial symmetry?

• A sea star

• A human

• A shark

• A snake

Which of these is a true statement about jellyfish?

• They swim by pumping their powerful tentacles

• They propel themselves with jet-like streams of water

• They swim in much the same way fish do

• They mainly drift on ocean currents

Where can you find a medusa's nematocysts?

• On its tentacles

• Near its mouth

• Along its back

• Inside its body

Where would you find a sessile organism?

• Swimming through the sea

• Drifting on ocean currents

• Anchored to a rock

• Walking across the seafloor

How is a jellyfish's digestive system different from yours?

• Jellyfish excrete waste through their skin

• A jellyfish's digestive system has only one opening

• Jellyfish digest food outside their bodies

• Jellyfish are not able to digest meat

If you're stung by a jellyfish, you may experience inflammation. What does "inflammation" mean?

• Paralysis

• Fear

• Vomiting

• Pain and swelling

The Latin name "cnidaria" refers to what feature?

• Tentacles

• Stinging cells

• Lack of mobility

• Radial symmetry

Flagella inside a sponge keep water moving through its body. Why is this necessary?

• It prevents the sponge from floating away

• It allows the sponge to feed

• It allows the sponge to absorb carbon dioxide

• It maintains the water pressure inside the sponge

Tags

NGSS.MS-LS2-1

A new sponge may begin life as:

• A growth on an older sponge

• A piece cut off of an older sponge

• A mobile larva

• All of these