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Exploring Chondrichthyes: Sharks and Rays Evolution

Dive into the world of Chondrichthyes with a quiz on their defining traits, evolution, and fossil history. Test your knowledge on shark anatomy, tail shapes, and classification. Learn about important chondrichthian fossils and their significance in understanding marine life. Discover fascinating facts about the evolution of sharks and rays.

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Exploring Chondrichthyes: Sharks and Rays Evolution

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

  2. 1 The 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. 2 The tiger shark has which type of caudal fin: A homocercal B heterocercal C dorsal prominent D ventral prominent

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

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

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

  7. 6 The 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. 7 Cladoselache 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. 8 Both subclasses of chondrichthyes had their radiation event during the: A Cambrian B Devonian C Cretaceous D Tertiary

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

  11. 10 Evidence 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. 11 Hybodus 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

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