Sponges and Cnidarians

Which structures are found on sponges?

• pores

• medusae

• polyps

• stinging cells

Which characteristics describe cnidarians? Check all that apply.

• All cnidarians can reproduce asexually.

• Cnidarians are invertebrates.

• Cnidarians come in a single body form.

• Cnidarians come in two possible body forms.

• Some cnidarians can reproduce sexually.

Tags

NGSS.MS-LS3-2

Connor drew a Venn diagram to compare sponges and cnidarians.

Which label belongs in the area marked Y?

• Are covered in pores

• Reproduce by budding

• Live in fresh water

• Have a network of nerve cells

Tags

NGSS.MS-LS4-2

Which are characteristics of medusae?

• are sessile, have tentacles, mouths open downward

• swim freely, lack tentacles, mouths open upward

• swim freely, have tentacles, mouths open downward

• are sessile, lack tentacles, mouths open upward

Which are characteristics of polyps?

• swim freely, lack tentacles, mouths open upward

• are usually sessile, have tentacles, mouths open downward

• swim freely, have tentacles, mouths open downward

• are usually sessile, have tentacles, mouths open upward

They are both polyps and only reproduce asexually.

• They are both polyps and only reproduce asexually.

• Only the jellyfish is a medusa, and it reproduces in two stages.

• They are both medusae, and they reproduce sexually and asexually.

• Only the jellyfish is a polyp, and it reproduces in a single stage.

Tags

NGSS.MS-LS3-2

What is the function of cilia on a sponge larva?

• capturing food from water that surrounds the larva

• attaching to a surface to help the larva grow into a polyp

• helping the larva swim out of the adult sponge

• stinging predators that try to eat the larva

Quincy and Leon are comparing sponges and cnidarians. Quincy says that spicules in sponges are similar to stinging cells in cnidarians. Leon disagrees.

Which best explains who is correct?

• Leon is correct, because sponges have stinging cells and cnidarians have spicules.

• Quincy is correct, because both spicules and stinging cells can be used to protect against predators.

• Quincy is correct, because both spicules and stinging cells can be used for stinging prey.

• Leon is correct, because spicules help sponges during reproduction and stinging cells are not involved in reproduction.

Tags

NGSS.MS-LS4-2

Which feature in cnidarians is the strongest indicator that they are more complex than sponges?

• They have the ability to reproduce sexually.

• They have the ability to attach to surfaces

• They have a medusa body form.

• They have nerve cells.

Tags

NGSS.MS-LS4-2

Connor listed the steps involved when a Portuguese man-of-war reproduces.

1. Sperm and eggs are released into the water.

2. Eggs are fertilized.

3. Larvae develop and attach to a surface.

4. Larvae grow into polyps.

5. Each polyp forms tiny medusae.

Which describes the missing step?

• The larvae break into pieces after step 3.

• The polyps break into pieces after step 4.

• The medusae bud off the polyp after step 5.

• The polyps regenerate before step 5.

Tags

NGSS.MS-LS1-4