QUESTION 1 Which of the following is a group within Osteichthyes? Actinopterygii

Question

QUESTION 1

Which of the following is a group within Osteichthyes?

Actinopterygii

Urochordata

Placoderms

Chondrichthyes

0.5 points   

QUESTION 2

Of gnathostomes, hagfish, and lampreys, which two are more closely related to each other than they are to the third, according to recent molecular phylogenies?

lampreys and hagfish

lampreys and gnathostomes

They are equally related.

gnathostomes and hagfish

0.5 points   

QUESTION 3

The __________ is sometimes referred to as “the Age of Fishes”.

Devonian

Silurian

Mesozoic

Cambrian

0.5 points   

QUESTION 4

Which of the following is found only in chordates?

Gut with two openings

Radial cleavage

Dorsal hollow nerve cord

Lophophore

0.5 points   

QUESTION 5

The jaws of gnathostomes are homologous to the __________ of jawless fishes.

dorsal hollow nerve cord

notochord

conodont elements

anterior gill arches

0.5 points   

QUESTION 6

Echinoderms are distinct from other animals in having:

A notochord

Bilateral symmetry

A water vascular system

Nematocysts

0.5 points   

QUESTION 7

The greatest diversity (i.e., number of species) of vertebrates is found in:

Tetrapoda.

Chondrichthyes.

Cephalochordata.

Actinopterygii.

0.5 points   

QUESTION 8

Of cephalochordates, urochordates, and vertebrates, which two are more closely related to each other than they are to the third, according to the most recent studies?

urochordates and cephalochordates

They are equally related to one another.

vertebrates and cephalochordates

urochordates and vertebrates

0.5 points   

QUESTION 9

If lampreys and hagfish are more closely related to each other than they are to gnathostomes, this would imply that:

Hagfish should not be included in Vertebrata.

Vertebrae were lost in hagfish.

Gnathostomes are not monophyletic.

Lampreys are not vertebrates.

0.5 points   

QUESTION 10

True (cellular) bone is found in:

Chondrichthyes

Osteichthyes

Ostracoderms

Placoderms

Actinopterygii

Urochordata

Placoderms

Chondrichthyes

Explanation / Answer

Answer= the following is a group within Osteichthyes

Actinopterygii= constitude a clss or subclass of bony fishes

their superclass is osteichthyces

that have a skeleton composed of bone tissues

Incorrect options are =

Urochordata= sometimes called as tunicates

they are marine invertebrates belongs to subphylum tunicates

Placoderms= is an extinct class of armoured prehistoric fish

they belongs from subphylum gnathostomata

Chondrichthyes = are a class that contains cartilagenous fishes

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