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Select the option with a correct representation of an animal belonging to the below mentioned class of vertebrates.
I. The notochord is persisitent throughout life. The mouth is ventral.
II. The skin is moist without scales . The tail may be present.
III. 6 to 15 pairs of gill slits. Jaws absent.
IV. Viviparous usually. pinna present in most of the members.

A

`{:(I,II, III,IV),("Dog fish", "Ichthyophis","Calotes","Cains"):}`

B

`{:(I,II, III,IV),("Hagfish", "Salamandra","Betta","Aptenodytes"):}`

C

`{:(I,II, III,IV),("Pristis", "Hyla","Lamprey","Pteropus"):}`

D

`{:(I,II, III,IV),("Clarius", "Rana","Myxine","Delphinus"):}`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question about selecting the correct representation of an animal belonging to the specified class of vertebrates based on the given characteristics, we can break down the information step by step. ### Step 1: Analyze the Characteristics The question provides four distinct characteristics of a vertebrate: 1. The notochord is persistent throughout life. The mouth is ventral. 2. The skin is moist without scales. The tail may be present. 3. 6 to 15 pairs of gill slits. Jaws absent. 4. Viviparous usually. Pinna present in most of the members. ### Step 2: Identify the Class of Vertebrates - **Characteristic I**: The notochord being persistent throughout life and a ventral mouth suggests a group of vertebrates where the notochord is a defining feature. This is typical of **Chordata**. - **Characteristic II**: Moist skin without scales and the possibility of a tail indicates **Amphibia** (e.g., frogs). - **Characteristic III**: The presence of 6 to 15 pairs of gill slits and absence of jaws is characteristic of **Agnatha**, which includes jawless fish like lampreys and hagfish. - **Characteristic IV**: Viviparous nature and presence of pinna (external ear) indicate **Mammalia**, as most mammals are viviparous and have external ears. ### Step 3: Match Each Characteristic to Possible Animals - For **Characteristic I**, animals like cartilaginous fishes (e.g., sharks) have a persistent notochord but they have jaws. - For **Characteristic II**, amphibians like frogs (e.g., Hyla or Rana) fit well. - For **Characteristic III**, lampreys (e.g., Petromyzon) are jawless and have gill slits. - For **Characteristic IV**, mammals like bats (e.g., Pteropus) or dolphins (e.g., Delphinus) have external ears and are viviparous. ### Step 4: Determine the Correct Option Given the analysis: - The first option (Pristius) refers to a cartilaginous fish, which does not fit all characteristics. - The second option (Hyla) fits some characteristics but not all. - The third option (Lamprey) fits the characteristics of having gill slits and no jaws. - The fourth option (Pteropus) fits the mammalian characteristics but does not match the earlier characteristics. Based on the characteristics provided, the correct representation of an animal belonging to the specified class of vertebrates is **Lamprey**. ### Conclusion The correct answer is the **third option**: **Lamprey**. ---
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