Download Cnidarians Practice Sheet

Advanced Biology II
Cnidarians Practice Sheet
Fill-in-the-Blanks
All (1) _________________________ are tentacled, radial animals; they include jellyfishes,
sea anemones, corals, and freshwater animals like Hydra. Most of these animals live in the sea,
and they alone produce (2) _________________________, which are capsules capable of
discharging threads that entangle prey or fend off predators.
Cnidarians have two common body plans, the (3) __________________________ that look
like bells, upside-down saucers, or umbrellas, and the (4) __________________________ that has a
tubelike body with a tentacle-fringed mouth at one end. The saclike cnidarian processes food with
its (5)_____________________, a sheetlike lining with glandular cells that secrete digestive
enzymes. The (6) _______________________ covers the rest of the body’s surfaces. Each of these
linings is referred to as an (7) ___________________________. (8) ____________________________
cells form a “nerve net” that coordinates responses to stimulation. Working together with
(9)________________________ cells and (10) _______________________ cells, the nerve net
controls movement and shape changes.
General Questions
11. What does the Latin word Cnidaria mean?
12. What body shape do all Cnidarians have?
13. What do tentacles and stinging cells help Cnidarians do?
14. What does a polyp body look like? What is a Cnidarian that looks like this as an adult?
15. What does a medusa body look like? What is a Cnidarian that looks like this as an adult?
16. How do polyps reproduce asexually?