Tag: characteristics of vertebrates

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Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Petromyzon cannot be called as fish, as

  1. It lacks median fins

  2. It lacks paired fins

  3. It lacks an operculum

  4. It has acicular mouth
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Petromyzon is the scientific name of the sea lamprey. It is long and slender snake like organism. This organism is not called as the true fish. The organism lacks the paired fins. The organism have well developed dorsal and ventral finfolds. This finfolds helps in swimming and locomotion. 
Thus, the correct answer is option B.
Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

In which one of the following jaws are absent?

  1. Petromyzon

  2. Hagfish

  3. Hippocampus

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Petromyzon is the sea lamprey, which lacks bony teeth and jaws. Hagfish is eel-shaped, slime-producing marine fish. Along with lampreys, they are jawless and are living fossils.

So, the correct answer is option D.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

The lamprey is included in same taxonomic class as 

  1. Anolis

  2. Myxine

  3. Ambystoma

  4. Neoceratodus

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lamprey and hagfish or Petromyzon and Myxine are both agnathans as they are jawless fishes. They are sometimes considered as the earliest vertebrates. They also lack paired fins or stomach. They have a pineal eye. The adults and larvae usually have a notochord.

So, the correct answer is 'Myxine '.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Earliest jawed vertebrates were

  1. Ostracoderms

  2. Placoderms

  3. Crossopterygians

  4. Elasmobranchs
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Vertebrates are the subphylum of a Chordata. Placoderms were among the first jawed fish. The jaws are considered to evolve from the gill arches. Placoderms are the extinct class of armoured prehistoric fishes, known from fossils, which lived from the Silurian to the end of the Devonian period. Their head and thorax were covered by articulated armoured plates and the rest of the body was scaled or naked.

So, the correct answer is option B.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Kidney of fish is of type ......................

  1. Pronephros

  2. Opisthonephros

  3. Metanephros

  4. Nephridia
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cyclostomes are the organisms which belong to the group of chordates. These are the jawless fishes. The group also includes the lampreys and hagfishes. They have rounded mouths that lack jaws. The water keeps on cycling through the open mouth which cannot be closed due to lack of jaws. 

The opisthonephros is the kidney present in adults of these organisms. It is formed from the extended mesonephros along with the tubules from the posterior nephric ridge. 
Thus, the correct answer is option B.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Lamprey (Petromyzon) is included in 

  1. Gnathostomata.

  2. Cyclostomata.

  3. Chondrichthyes.

  4. Osteichthyes.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Lampreys are one of the jawless fishes of the order Petromyzontiformes. Petromyzon is the scientific name of the sea lamprey. Chordates are characterized by the presence of notochord. Cyclostomata is a type of Chordate, that comprises the living jawless fishes, like the lampreys and hagfishes. It is long and slender snake-like organism. This organism is not called as the true fish. The organism lacks the paired fins. The organism has well developed dorsal and ventral fin folds. These fin folds help in swimming and locomotion. The adult stage is characterized by a toothed, funnel-like sucking mouth.
Thus, the correct answer is option B.
Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

True fish possess gills and fins. Which one of the following is not a true fish?

  1. Carassius

  2. Hythalamincthyes

  3. Hippocampus

  4. Lepisma
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Carassius is a genus in the ray-finned fish family Cyprinidae.
Hippocampus is the name of marine fishes in the genus Hippocampus.
While Lepisma is a genus of primitive insects.
So, the correct answer is option D.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Which of the following is a jawless fish?

  1. Hippocampus

  2. Torpedo

  3. Petromyzon

  4. Mystus
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The hippocampus is the name of marine fishes.
Torpedo is the group of flattened cartilaginous fishes, also called an electric ray.
Mystus is a genus of small to medium-sized bagrid catfishes.
Petromyzon is the 'sea lamprey', which is parasitic lamprey. It is a 'jawless' fish.

So, the correct answer is option C.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Which strucutres is seen cyclostomes?

  1. Pineal eye

  2. Jaws

  3. Pectoral fin

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In cyclostomes, the pineal gland is a photoreceptor. The endocrine nature of the gland's function has not been definitely established. As it's activity diminishes with age, the gland turns into rudimentary organ containing mineral deposits.

So, the correct answer is option A.