1. Unit #7, Quiz #1 2013-2014 Grade: «grade» Subject: «subject» Date: «date»

2. 1The defining characteristic of an animal in the class Chondrichthyes is: A aggressive behavior B a cartilaginous skeleton C a lineagethat goes back hundreds of millions of years D the constant shedding & regrowing of teeth

3. 2The tiger shark has which type of caudal fin: A homocercal B heterocercal C dorsal prominent D ventral prominent

4. 3Sharks have a very streamline shape that is called: A Coelomate B Psuedocoelomate C Pentameric D Fusiform

5. 4The oldest known unambiguous chondrichthyes was found during the: A Silurian Period B Devonian Period C Cambrian Period D Tertiary Period

6. 5All of the following are in the subclass of Elasmobrachii, EXCEPT: A sharks B rays C chimeras D skates

7. 6The heterocercal shape of a shark's tail is beneficial because: A it allows the shark to use countershading as camouflage so that it cannot be seen from above or below B with each swish of the tail the shark amplifies its ability to detect both electrical and chemical changes in the water C with each side-to-side movement of the tail, both forward and upward force is generated D it allows the rostrum to protrude forward and increases the abilities of chemoreceptors found within this organ

8. 7Cladoselache was an important chondrichthian fossil because: A its dorsal fins were used to walk across the bottom of the ocean B it had heterodont dentition C it was the first example of a species with a rostrum D it had ligamentous teeth arranged in a whorl-shape arrangement

9. 8Both subclasses of chondrichthyes had their radiation event during the: A Cambrian B Devonian C Cretaceous D Tertiary

10. 9Sharks evolved their modern appearance during the ________ A Carboniferous Period B Holocene Epoch C Pleistocene Epoch D Jurassic Period

11. 10Evidence suggests that the Megalodon A was the largest aggresive carnivore on record B had the most teeth of any known predatory animal C was the largest animal ever to exist in the water D still exists in large populations today

12. 11Hybodus was an important chondrichthian fossil because: A its dorsal fins were preceded by large spines B it had heterodont dentition C it was the first example of a species with a rostrum D it had ligamentous teeth arranged in a whorl-shape arrangement