Tag: characteristics of vertebrates

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

Which is true?

  1. All living members of class cyclostomata are parasites on some fishes

  2. There are about 2000 species in the class osteichthyes

  3. Ciona belongs to subphylum cephalo chordata

  4. Arthropods are diploblastic animals

  5. Ascaris lumbricoides is a flatworm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cyclostomes (like lampreys) are jawless vertebrates that are often ectoparasites on other fishes. Option C is wrong because Ciona is a Urochordate, not a Cephalochordate.

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

Agnatha or Cyclostomata are characterised by

  1. Absence of jaws and presence of suctorial mouth.

  2. Presence of suctorial mouth, the absence of jaws, the presence of single nostril and unpaired fins.

  3. Absence of mouth, presence of single nostril.

  4. Round mouth with triradiate lips.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Agnatha is a paraphyletic super class of jawless fish. It includes class Cyclostomata and an extinct class Ostracodermi. Characteristics of fishes of Agnatha are:
  • They are jawless.
  • They have a single median nostril.
  • Their mouth is suctorial and circular.
  • Body is elongated but no paired appendages or fins are present i.e. fins are unpaired.
Hence, statement B is correct. So, the correct answer is 'Presence of suctorial mouth, absence of jaws, presence of single nostril and unpaired fins'.
Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Fish vertebrates are

  1. Ostractodermi

  2. Placodermi

  3. Cyclostomates

  4. Choanochthyes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A. Ostractodermi is the extinct class under the superclass Agnatha which are called jawless vertebrates.
B. Placodermi is an extinct class of armoured freshwater fishes which are known as fossils.
C. Cyclostomates are the round mouthed fishes. The class Cyclostomata comes under the superclass Agnatha.
Hence, fish veretbrates are Ostracodermi.
So, the correct answer is 'Ostracodermi'.
Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Unpaired external naris occurs in

  1. Petromyzon

  2. Torpedo

  3. Anabas

  4. Solea
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A. Petromyzon, known as Lamprey, belong to class Cyclostomata under superclass Agnatha (jawless vertebrates).
B. Torpedo, known as an electric ray, is a bottom-living marine fish which is famous for discharging electricity.
C. Anabas, known as climbing perch is a common freshwater fish that can also live out of water for some time.
D. Solea, known as a common sole, is a flatfish that is prized for food.
Unpaired external naris (nostrils) occur in Petromyzon. So, the correct answer is 'Petromyzon'.
Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

An example of Agnatha (jawless vertebrate)/cyclostomata is

  1. Labeo rohita

  2. Scoliodon

  3. Rana tigrina

  4. Petromyzon
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A. Labeo rohita belongs to class Osteichthyes.
B. Scoliodon belongs to class Chondrichthyes.
C. Rana tigrina belongs to class Amphibia.
D. Petromyzon belongs to class Cyclostomata under superclass Agnatha (the Jawless vertebrates).
So, the correct answer is 'Petromyzon'.
Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

A jawless fish which lays eggs in fresh water and whose ammocoete larvae after metamorphosis return to ocean is _____________.

  1. Entatretus

  2. Myxine

  3. Neomyxine

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

Petromyzon (lamprey) is an anadromous fish that migrates from the ocean to fresh water to spawn, and its larvae are called ammocoetes.

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

Choose the correct statement.

  1. All pisces have gills covered by an operculum

  2. All mammals are viviparous

  3. All cyclostomata do not possess jaw and paired fins

  4. All reptiles have a three chambered heart
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cyclostomes are characterized by the absence of jaws and paired fins. Other options are false because not all pisces have an operculum (e.g., sharks), not all mammals are viviparous (e.g., monotremes), and not all reptiles have a three-chambered heart (crocodiles have four).

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

Match the columns and select the correct option.

  Column I    Column II
a Cyclostomates p Hemichordata
b Aves q Urochordata
c Tunicates r Agnatha
d Batanoglossus s Pisces
e Osteichthyes t Tetrapod

  1. a - p, b - q, c - r, d - s, e - t

  2. a - q, b - r, c - s, d - p, e - t

  3. a - r, b - p, c - t, d - q, e - s

  4. a - r, b - t, c - q, d - p, e - s

  5. a - t, b - r, c - q, d - p, e - s
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cyclostomates are Agnatha (r), Aves are Tetrapods (t), Tunicates are Urochordata (q), Balanoglossus is Hemichordata (p), and Osteichthyes are Pisces (s).