___________________ 1. The __?__, a kind of hydrozoa, is made up of floating colonies containing several specialized kinds of polyps.

___________________ 2. What do we call the motile bell-shaped stage of a cnidarian.

___________________ 3. A true jellyfish belongs to the class

___________________ 5. In cnidarians, the medusa releases the fertilized egg that grows into a (an) _____.

___________________ 6. The organs in a medusa that detect the presence of light are

___________________ 7. The __?__ form of a cnidarian is umbrella-shaped.

___________________ 8. The thick, jellylike substance in the body wall of a cnidarian is the

___________________ 9. In any cnidarian, digestion takes place in the gastrovascular cavity. T/F

___________________ 10. What phylum of animals are soft-bodied with sting tentacles arranged in circles around their mouth.

___________________ 11. The __?__ is the space between the two tissue layers of a cnidarian.

___________________ 12. The __?__ is the outermost layer of cnidarian.

___________________ 13. Stinging structures found on cnidarians are called

___________________ 14. Many cnidarians can live only in bright light because they depend on

___________________ 16. In a medusa, the organs that detect the presence of light are _____.

___________________ 17. The inner layer of a jellyfish is the _____.

___________________ 18. Jellyfish are in the class _____.

___________________ 19. In the Portuguese man-of-war, a single polyp

___________________ 20. The Great Barrier Reef off Australia is made up of

___________________ 21. A class of Cnidarians that spends most of its life as polyps are called

___________________ 22. __?__ have only the polyp stage in their life cycle.

___________________ 23. In a medusa, the organs involved in balance are

___________________ 24. In the class __?__, the medusa is large and long-lived, and the polyp is restricted to a tiny larval stage.

___________________ 25. The nervous system of hydra consists of a nerve net. T F

___________________ 26. Any soft-bellied animal with stinging tentacles arranged in a circle around its mouth is a

___________________ 27. In the class __?__ are the sea anemones and corals.

___________________ 28. Most sea anemones, unlike corals,

___________________ 29. The class Anthozoa contains

___________________ 30. Most cnidarians can reproduce

___________________ 31. What do we call the sessile flowerlike stage of a cnidarian.

___________________ 32. Digestion takes place in the __?__ in cnidarians.

___________________ 33. The __?__ is the innermost layer, or endoderm, of cnidarian.

___________________ 34. The __?__ make up coral reefs.

___________________ 35. If a polyp is inverted, it is essentially a (an) _____.

___________________ 36. The __?__ form of cnidarians is free-swimming.

___________________ 37. Cnidarian have a body wall that surrounds an internal space called a

___________________ 38. The nerve cells of cnidarians make up a (an)

___________________ 39. Most cnidarians contain stinging cells known as _____.

___________________ 40. A(n) __?__ is a stinging cell found in cnidarians.

___________________ 41. Coral construct shells or skeletons from the chemical

___________________ 42. Most common freshwater hydroza is the

___________________ 43. The __?__ have only polyp forms.