Zoology Sponges, Cnidarians and Anatomical terms

Sea anemones and corals lack

• a medusa stage
• a polyp stage
• a sexual stage
• an asexual stage

Hydra reproduce asexually by

• buds
• nematocysts
• gland cells
• gametes

The anthozoans include

• Box jellies & Anemones
• Corals & Anemones
• Comb jellies & Corals
• Hydra & Euglena

Instead of a digestive system, cnidarians have a

• gastrovascular cavity
• multiple stomachs
• nothing, and instead use osmosis
• a gastrointestinal tract

Cnidarians have nerves, but no central nervous system

• True
• False

How many body openings do cnidarians have?

• 1
• 2
• 3
• None

The bell shaped, free swimming form of cnidarians is the

• polyp
• medusa
• planula
• mesoglea

Which class of cnidarians are known as the true jellyfish?

• Scyphozoa
• Anthozoa
• Hydrozoa
• Cubozoa

Microscopic zooanthellae are photosynthetic algae that

• live in coral tissue and make food
• prey on cnidarians
• live in the stomachs of jellyfish and help them digest
• help cnidarians camoflague themselves

What type of symmetry do Cnidarians have?

• Asymmetrical

• Bilateral

• Radial

• Medial