Tag: biology

Questions Related to biology

Which one pair comprises jawless fishes?

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

  1. Mackerels and Rohu

  2. Lampreys and Hag Fishes

  3. Lampreys and Eels

  4. Guppies and Hag Fishes

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Correct Option: B

Agnatha or Cyclostomata are characterised by

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

  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.

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Correct Option: B
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'.

Fish vertebrates are

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

  1. Ostractodermi

  2. Placodermi

  3. Cyclostomates

  4. Choanochthyes

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Correct Option: A
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'.

Unpaired external naris occurs in

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

  1. Petromyzon

  2. Torpedo

  3. Anabas

  4. Solea

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Correct Option: A
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'.

An example of Agnatha (jawless vertebrate)/cyclostomata is

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

  1. Labeo rohita

  2. Scoliodon

  3. Rana tigrina

  4. Petromyzon

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Correct Option: D
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'.

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

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

  1. Entatretus

  2. Myxine

  3. Neomyxine

  4. Petromyzon

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Correct Option: D

Jawless vertebrates belong to the group

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

  1. Agnatha

  2. Gnathostomata

  3. Lagomorpha

  4. Prototheria

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Correct Option: A

Choose the correct statement.

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

  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

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Correct Option: C

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

  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

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Correct Option: C

Myelin sheath is not found around nerve fibres of.

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

  1. Fishes

  2. Egg laying mammals

  3. Frog

  4. Cyclostomates

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Correct Option: D