Cnidarian Coloring ActivityName _______________________________

I. The Hydra

A. Basal disc- blueB. Epidermis- greenC. Mouth- redD. Epitheliomuscular cell- greenE. Cnidocyte- pinkG. Nerve fiber & cell- orangeH. Mesoglea- blackI. Gastrodermis- light purpleJ. Gland cell- dark purpleK. Gastrovascular cavity- yellowM. Ovary- light brownN. Testis- dark brown

Use your Guided Notes and the Zoology text book (pages 156-165 to answer the questions.1. The hydra is diploblastic which means it has 2 tissue layers. What are the two tissue layers that they have and

what is the layer that separates them? _______________________________________________________________________________________

2. Which structure contains a nematocyst for stinging prey? _______________________________3. Where is food digested in the hydra? ________________________________________________4. After the food is digested, where are wastes released? __________________________________5. Since both ovaries and testes are present in the hydra you can conclude that it is a ____________________.6. What body form does a hydra exhibit? ____________________7. What class does the hydra belong to? _____________________

II. The Hydra Cnidocyte

C. Nematocyst- light greenD. Cnidocyte- pinkE. Operculum (lid)- orangeF. Nucleus- blackG. Cnidocil- purpleJ. Barb- redK. Thread- blueL. Prey- brown

1. What is the difference between the nematocyst and the cnidocyte?

2. Using the picture and words in the bank above, write a paragraph describing how the cnidocyte functions.

CC

III. Aurelia (Common Jellyfish)

A. Epidermis- greenB. Mesoglea- blackC. Gastrodermis- light purpleD. Exumbrellar surface- greenE. Subumbrellar surface- greenF. Nerve net/circular muscle- orangeG. Oral arms- pinkH. Mouth- redI. Gullet- yellowJ. Stomach- yellowK. Gastric pouch- yellowL. Radial canal- yellowM. Ring canal- yellowN. Gonads (reproductive organs)- brownO & P. Sensory organs- blue

(use your notes and pages 161-162)1. What class does Aurelia belong to? ___________________________________2. What do you think is the function of the oral arms? (What type of cells does it probably have?) ____________________

__________________________________3. Trace the path of food from the mouth to the ring canal.

4. Where does undigested food and reproductive cells come out of the Aurelia? ___________________________________5. The radial and ring canals are part of the _____________________________system.6. One type of sensory organ is a photoreceptor. What does it probably detect? ____________________________7. Another type of sensory organ is a chemoreceptor. What does it probably detect? ____________________________8. Why would having photo- and chemoreceptors be important? ___________________________________ ___________________________________9. What body form does Aurelia have? ___________________________________