Ch. 7: Cnidarians

Question 1

What is the body symmetry for Cnidarians?

Answer 1

Radial

Question 2

Are Cnidarians triploblastic or diploblastic?

Answer 2

Diploblastic

Question 3

Cnidocyte (cnidoblast)

Answer 3

Distinctive cell with harpoon-like nematocyst in Cnidarians

Question 4

3 Classes of Cnidarians

Answer 4

1. Hydrozoa
2. Scyphozoa
3. Anthozoa

Question 5

Hydrozoa

Answer 5

Phylum Cnidarian

• asexual and sexual reproduction
• velum present

Question 6

Scyphozoa

Answer 6

Phylum Cnidarian

• Both medusa & polyp form but medusa is predominant
• Does not have a velum

Question 7

Anthozoa

Answer 7

Phylum Cnidarian

• No medusa stage
• Gastrovascular cavity divided by septa

Question 8

Digestion of Cnidarians

Answer 8

Extracellular digestion in gastrovascular cavity and intracellular digestion in gastrodermal cells