Sponges and Cnidarians

Question 1

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

Revolt · Accepted Answer

They have nerve cells.

Question 2

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

Revolt · Accepted Answer

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

Question 3

Which lists important roles of coral reefs?

Revolt · Accepted Answer

offering medical benefits to humans, protecting beaches, supporting a variety of organisms

Question 4

Which characteristics describe cnidarians? Check all that apply. Cnidarians are vertebrates.Cnidarians are invertebrates.Cnidarians come in a single body form.Cnidarians come in two possible body forms.Some cnidarians can reproduce sexually.All cnidarians can reproduce asexually.

Revolt · Accepted Answer

Cnidarians are invertebrates.; Cnidarians come in two possible body forms.; Some cnidarians can reproduce sexually.; All cnidarians can reproduce asexually.

Question 5

Which structures are found on sponges?

Revolt · Accepted Answer

pores

Question 6

Which correctly compares a jellyfish and a coral?

Revolt · Accepted Answer

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

Question 7

How are coral reefs similar to tropical rainforests?

Revolt · Accepted Answer

Both support a huge quantity and variety of organisms.

Question 8

Which are characteristics of medusae?

Revolt · Accepted Answer

swim freely, have tentacles, mouths open downward

Question 9

pollutionwaveshumansother organisms

Revolt · Accepted Answer

waves

Question 10

Which are characteristics of polyps?

Revolt · Accepted Answer

are usually sessile, have tentacles, mouths open upward

Sponges and Cnidarians Answers

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