Tag: classification of vertebrata

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

Common name of Petromyzon is

  1. Lancet

  2. Hagfish

  3. Acornworm

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

Sea Lamprey or Petromyzon is an agnathan. It is a marine organism. It lacks jaws and resembles an eel. It has a sucker-like mouth that is involved in filter feeding. It has seven brachial openings behind its eyes. They are anadromous and are usually found at depths of around 4000 m and can tolerate temperature ranges from 1.0 and 20 °C.

So, the correct answer is 'Lamprey'.

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

Vertebrates without jaws belong to 

  1. Urochordata

  2. Hemichordata

  3. Agnatha

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

Agnathans are basically primitive jawless fishes. They include lampreys and hagfishes. They usually have soft, cylindrical bodies that lack scales. In some species, separate external gill slits are present, while they open via a single pore in others. They have a suctorial or a filter-feeding mouth and they lack jaws.

So, the correct answer is 'Agnatha'.

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

Which one of the following pairs of animals are jaw-less fishes?

  1. Lampreys and hag fishes

  2. Guppies and hag fishes

  3. Lampreys and eels

  4. Mackerels and rohu
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The class Agnatha consists of a group of animals, that lack jaws and paired fins. There are two living groups of Agnatha, the lampreys, and the hagfish. 

So, the correct answer is option A.

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

The type of tail seen in Cyclostomata is 

  1. Isocercal.

  2. Homocercal.

  3. Heterocercal.

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

Cyclostomata is a group of chordates comprising of living jawless fishes, the lampreys, and hagfishes. Their tail is protocercal in cyclostomes, having a caudal fin extending around the end of the vertebral column. The protocercal tail is formed by the division of tail into two equal lobes supported by fins.

Hence, option D is correct.

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

The jawless vertebrate is 

  1. Crocodile

  2. Loris

  3. Hyla

  4. Fox

  5. Petromyzon
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Out of the given options, only Petromyzon is a jawless vertebrate, that is, it is an agnathan. In physical appearance, it resembles an eel. It has a sucker-like mouth that is involved in filter feeding. The rest of the examples are all gnathostomes or jawed vertebrates. 

So, the correct answer is 'Petromyzon'.

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

The larva of cyclostomates is known as 

  1. Lamprey

  2. Amphioxus

  3. Ascridian

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

Cyclostomata is a group of chordates that comprises the living jawless fishes, the lampreys, and hagfishes. They lay numerous eggs, about 1mm in diameter and lodge in the gravel around the nest. The egg hatches into an ammocoete larva, which is a blind, worm-like animal that burrows in the slit.

So, the correct answer is option D.

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.