Question:

1. Address the following questions for the Cnidaria. Your answer for parts a-g combined must not be fewer than 150 words. (35 points)
1. Describe the basic body plan of a cnidarian. Include any distinctive features. The better answers will not fail to mention basic body forms (polyp & medusa), cell layers, mesoglea, tentacles, mouth/anus, gastrovascular cavity. 5 pts
1. Do the Cnidaria have tissues? If so, what kind of tissues do they have? 5pts

1. How is an organ defined? Do the Cnidaria have organs ? If so, what organs ? 5pts

1. About how many species of Cnidaria are recognized? Sources may differ a bit so use a reasonable source and cite it. 5 pts

1. In what kind of habitat are they found? ? (g., Saltwater? Freshwater? Terrestrial ? Etc.). Are they equally common in all habitats where they are found? Where they do occur, are cnidarians free-swimming, attached to a substrate, crawling over a surface, burrowing, etc. ? 5 pts

1. Do cnidarians occur everywhere in the world that their habitat is found? Do any cnidaria occur here in Ohio? 5 pts

1. Dr. Rauschert talked about energy flow in ecosystems and trophic levels. Where do the Cnidaria fit it here? Describe the basic ecology of a cnidarian. How does the anatomy of a cnidarian reflect its basic ecology? Dr. Rauschert also talked about symbioses. Do any Cnidaria have interesting symbioses? (HINT: the answer here is “yes”, and it affects the answer about the trophic level of some cnidarians). 5 pts

1. According to the phylogenic tree (Fig. 1) below…3 bonus pts
1. Is Chordata (represented by the mouse on the tree) more closely related to Porifera or to Cnidaria. Justify your answer.
2. What feature(s) separates Porifera and Cnidaria from all other ‘higher’ groups?

You must write your answer in your own words. To do otherwise is plagiarism, which is one form of academic misconduct. You may not “cut & paste” any part of your answer. You may not “cut & paste” any material and then modify that material; to do so still is plagiarism. Write your answer in your own words.

Your answer to questions 1 & 2 each must be at least 150 words (for a total of at least 300 words for the entire report), and must be submitted as a single Word document through Turnitin.

Be certain that you fully acknowledge all of the sources of information that you use to answer these questions.

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