Please choose the best possible answer in the following multiple-choice question

Question

Please choose the best possible answer in the following multiple-choice questions. 1. Animals probably evolved from a. Placozoans that formed colonies b. Choanoflagellates that formed colonies All protozoa d. c. Both a and b Which of the following represent an early branch on the animal family tree? a. Placozoans b. Choanoflagellates c. All protozoa d. Both a and b Which of the following is notan arachnid? a. Tick b. Spider c. Beetle d. Mite 2. 3. 4. Nematocysts are found in: a. Squids b. Cone snails c. Horseshoe crabs d. Cnidarians Which of the following is not a mollusk? a. Barnacle b. Octopus c. Scallop d. Squid A 4-chambered heart is seen in: a. Birds b. Mammals C. Crocodilians d. All of the above 5. 6.

Explanation / Answer

1. d) both a and b

2.d) both a and b

(placozoa are basal version of invertebrates and are hypothesized to have evolved into animals; Choanoplagellates are considered as the closes unicellular relatives of animals)

3. c) beetle (arachnids are arthropods in which the front pair of appendages have been modified to perform sensory functions)

4. d) cnidarians (nemocytes are tiny elongated/spherical capsules; also called sting cells)

5. a) barnacle (its an arthropod)

6. d) all of the above

7. b) mollusks (it is a chitinuous ribbon, finely toothed and used for feeding)

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