Tag: classifications of chordata

Questions Related to classifications of chordata

1) The body is long, eel like. It shows trunk and compressed tail.
2) Paired fins are absent. Median fin is supported by cartilaginous fin-rays.
3) The skin is soft and smooth. It is slimy. It has scale less.
4) Z shaped myomeres are present in the trunk and tail protractor and retractor muscles move the tongue.
5) In this group, a true coelome is seen.
These characteristics are seen in the class

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

  1. Cyclostomata

  2. Pisces

  3. Reptilia

  4. Aves

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Correct Option: A
Explanation:
Cyclostomes' are jawless vertebrates, They are primitive vertebrates. The cyclostomes are marine or fresh-water vertebrates.

It includes the lampreys and hag fishes.
1) The body is long, eel like. It shows trunk and compressed tail.
2) Paired fins are absent. Median fin is supported by cartilaginous fin-rays.
3) The skin Is soft and smooth. It is slimy. It as scale less.
4) Z shaped myomeres are present in the trunk and tail Protractor and retractor muscles move the tongue.
5) In this group, a true coelome is seen.
6) These vertebrates will not have jaws, hence called Agnatha.
7) The mouth is circular. It works like a sucker. It is surrounded by tentacles.
8) Tongue bears teeth.
9) Stomach is absent and oesophagus leads into the intestine.
10) Endoskeleton is present.
11) Skull is simple and primitive.
12) Notochord presists throughout life.
13) Vertebrae are represented by neural arches, around the notochord.
14) Five to sixteen pairs of gills are present in sac like pouches
15) The heart is two chambered. Sinus venousus is present, but conus arterlcsus is absent.
16) Blood contains leucocytes and Irregular nucleated erythrocytes..
17) Brain is seen.
18) Ten pairs or less number of cranial nerves are present.
19) Nasal sac is single and median.
20) Lateral line sense organ is present.
21) Excretory system includes a pair of mesonephric kidneys.
22) Sexes are separate.
23) Gonad is single and without a gonoduct.
24) Development may be direct or with a long larval stage.

Fishes which are parasite as well as scavanger are

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

  1. Ostracoderm

  2. Cyclostomata

  3. Tetrapoda

  4. All of the above

Show answer
Correct Option: B
Explanation:

Cyclostomata is a group of chordates that comprises the living jawless fishes: lampreys and hagfishes. Both groups have round mouths that lack jaws but have retractable horny teeth. The name Cyclostomata means "round mouths". These fishes are parasites and as well as scavengers. They feed off dead and wounded organisms in the ocean. 

Therefore, the correct answer is option B.

Jawless circular and suctorial mouth are characteristic feature of 

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

  1. Agnathe animals

  2. Gnathostomes

  3. Cyclostomes animals

  4. Both A and C

Show answer
Correct Option: D
Explanation:

The subphylum vertebrae are  classified into Agnatha or Agnathostomata- includes vertebrates without jaws. Further, this group has only one class the Cyclostomata. The Cyclostomes are jawless vertebrates with a circular mouth and suctorial funnel.

So, the correct answer is option D.

Petromyzon attaches to the host body with the help of

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

  1. Suckers

  2. Hookes

  3. Both A and B

  4. Suctorial mouth

Show answer
Correct Option: D
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. Hence, option D is correct answer.

Which of the following are jawless animals?

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

  1. Gnathostomata

  2. Agnatha

  3. Both A and B

  4. None of the above

Show answer
Correct Option: B
Explanation:

Agnatha is a superclass of jawless fishes in the phylum Chordata. These are ectothermic, meaning they do not regulate their own body temperature. They show slow metabolism in cold water. They do not have a proper stomach rather they have a long homogenous gut.
So, the correct answer is option B.

Hag fish is another name for

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

  1. Petromyzon

  2. Lamprey

  3. Myxine

  4. Cephalaspis

Show answer
Correct Option: C
Explanation:

Myxine is scientific name of hagfish. They are eel-shaped, slime-producing marine fish. They are the only known living animals that have a skull but no vertebral column. Classification of Myxine is

Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Superclass: Cyclostomata
Class: Myxini
Order: Myxiniformes
Therefore, the correct answer is option C.

Lamprey (Petromyzon) belongs to

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

  1. Chondrichthyes

  2. Osteichythes

  3. Agnatha

  4. Amphibia

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

Humans fall into which kingdom Animalia category?

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

  1. Hemichordata

  2. Mollusca

  3. Chordata

  4. None of the above

Show answer
Correct Option: C
Explanation:

Humans are categorized as vertebrates in the phylum Chordata. The phylum Chordata contains all animals that possess, at some point during their lives, a hollow nerve cord, and a notochord, a flexible rod between the nerve cord and the digestive track. The phylum Chordata is an extremely diverse phylum and the one most recognizable to us. 

So, the correct answer is option C.

Pancreas is absent in

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

  1. Amphibia

  2. Osteichthyes

  3. Chondrichthyes

  4. Cyclostomata

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Correct Option: D
Explanation:
A. Amphibians are the cold-blooded, freshwater vertebrates which can live both on land and in water.
B. Osteichthyes is the class of bony fishes which include lungfishes, ray-finned fishes and lobe-finned fishes.
C. Chondrichthyes is a class of Cartilaginous fishes which include sharks, rays and Chimaeras.
D. Cyclostomata is a class of round mouthed fishes under the superclass Agnatha which is known as Jawless vertebrates. The digestive system of Cyclostomata lacks stomach and pancreas.
So, the correct answer is 'Cyclostomata'.

An egg-laying mammals is

zoology animal diversity - ii (phylum: chordata) aves and mammalia classifications of chordata aves

  1. Echidna

  2. Bat

  3. Whale

  4. All of the above

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Correct Option: A
Explanation:

Egg laying mammals are known as monotremes. They are named so because of the presence of a single cloacal opening in their bodies that serves as a passage for eggs or sperms, feces, and urine. As suggested by egg-laying mammal facts, only five species of monotremes are extant, one of which is duck-billed platypus and remaining four belong to the echidna family.