Tag: classifications of chordata

Questions Related to classifications of chordata

Circular and suctorial mouth is present in

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

  1. Labeo

  2. Petromyzon

  3. Scolidon

  4. All of the above

Show answer
Correct Option: B
Explanation:

Petromyzon (lampreys) are all carnivorous and are true predators. The method of attack is very peculiar. It attack fishes, turtles etc and it attach themselves by suctorial mouth which is circular in shape. Mouth acts a sucker, it rasps the flesh of the prey with its tongue. Teeth which are situated around the mouth sink into the flesh of the prey and serve it to hold properly. 

So, the correct answer is option B.

Kingdom Animalia is also known as

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

  1. Metazoa

  2. Protozoa

  3. Both A and B

  4. None of the above

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Correct Option: A
Explanation:

Metazoa is the term given to the fully developed complex organism having tissue level organization. Kingdom Animalia is considered as metazoa. All the members of this kingdom are multicellular, eukaryotes. They are heterotrophs, they depend on other organisms directly or indirectly for food. Most of the organisms are motile which means they can move independently and spontaneously. 

So, the correct answer is option A.

Vertebrata consist of which classes from the following?

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

  1. Bony fish

  2. Amphibians

  3. Reptiles

  4. All of the above

Show answer
Correct Option: D
Explanation:

Vertebrata is the most important part of chordate and is distinguished by a backbone (made either of bone or cartilage) having bones known as vertebrae and a skull enclosing a brain. The nervous system is entirely protected by these structures and also maintains the shape of the body.

The subphylum vertebrata is divided into seven classes: jawless fish, cartilaginous fish, bony fish, amphibians, reptiles, birds and mammals. 
So, the correct answer is option D.

Which of the following is the most important part of chordate?

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

  1. Hermichordate

  2. Vertebrata

  3. Mollusca

  4. All of the above

Show answer
Correct Option: B
Explanation:

Vertebrata is the most important part of chordate and is distinguished by a backbone (made either of bone or cartilage) having bones known as vertebrae and a skull enclosing a brain. The nervous system is entirely protected by these structures and also maintains the shape of the body.

So, the correct answer is option B.

In bioluminesence storage, energy changes into _____________.

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

  1. Light energy

  2. Radiant energy

  3. Chemical energy

  4. Mechanical energy

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Correct Option: A
Explanation:

In bioluminescence, stored chemical energy on oxidation emits lights.

Petromyzon belongs to class

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

  1. Osteichthyes

  2. Chondrichthyes

  3. Cyclostomata

  4. Amphibia

Show answer
Correct Option: C
Explanation:
A. Class Osteichthyes comes under the superclass Pisces and includes lungfishes, lobbed finned fishes and ray-finned fishes.
B. Class Chondrichthyes comes under the superclass Pisces. Most fishes are marine and a few live in the tropical rivers.
C. Class Cyclostomata comes under superclass Agnatha which is a paraphyletic superclass of jawless fishes.
D. Class Amphibia comprises the animals that inhabit both land and water.
Petromyzon belongs to class Cyclostomata.
So, the correct answer is 'Cyclostomata'.

Which is true?

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

  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

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Correct Option: A

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

Show answer
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.

Show answer
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

Show answer
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'.