Unit #7, Quiz #1 2013-2014

Grade:«grade»

Subject:«subject»

Date:«date»

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

2 The tiger shark has which type of caudal fin:

A homocercal

B heterocercal

C dorsal prominent

D ventral prominent

3 Sharks have a very streamline shape that is called:

A Coelomate

B Psuedocoelomate

C Pentameric

D Fusiform

4 The oldest known unambiguous chondrichthyes was found during the:

A Silurian Period

B Devonian Period

C Cambrian Period

D Tertiary Period

5 All of the following are in the subclass of Elasmobrachii, EXCEPT:

A sharks

B rays

C chimeras

D skates

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

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

8 Both subclasses of chondrichthyes had their radiation event during the:

A Cambrian

B Devonian

C Cretaceous

D Tertiary

9 Sharks evolved their modern appearance during the ________

A Carboniferous Period

B Holocene Epoch

C Pleistocene Epoch

D Jurassic Period

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

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