Cnidaria

Question 0

Why are Hydras unique in the class Hydrozoa?

Answer 0

They do not have a medusa stage

Question 1

What is the phylum, class, and order of Hydra?

Answer 1

Phylum Cnidaria, class Hydrozoa, order Hydroida

Question 2

What is the marine colonial hydroid of the class Hydrozoa that is more plant-like than animal-like and has a very small medusa life form?

Answer 2

Obelia

Question 3

What is the warty appearance of the tentacles caused by in hydra? (These contain nematocysts which are stinging organelles)

Answer 3

Cnidocytes

Question 4

What is the hairlike structure of the cnidocyte that is involved with the discharge of the nematocyst?

Answer 4

Cnidocils

Question 5

What substance is release by a Hydra’s prey that is found in living cells and is released by the wounds of the prey as caused by the nematocyst which causes the Hydra to open it’s mouth?

Answer 5

Glutathione

Question 6

What is the phylum, class, and order of Obelia?

Answer 6

Phylum: Cnidaria; Class: Hydrozoa; order; Hydroida

Question 7

What is the common name for the phylum Cnidaria?

Answer 7

Radiates

Question 8

What level of organization do Cnidaria demonstrate?

Answer 8

Tissue level of organization

Question 9

What is the part of the Hydra begins extracellular digestion and then follows with intracellular digestion?

Answer 9

Gastrodermis