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Which of the following statements is cor...

Which of the following statements is correct for the phylum whose organisms are characterized by the presence of a dorsal hollow nerve cord and paired pharyngeal gill slits ?

A

In all protochordates , notochord extends from head to tail region and is persistent throughout the life.

B

The members of the class to which Myxine belongs show the presence of a sucking and circular mouth without jaws.

C

Members of the class Osteichthyes show the presence of an air bladder , a streamlined body and four gills covered by operculum.

D

Thee members of the class to which the frog belongs are cold blooded , show external fertilization and a three chambered heart i.e one auricle and two ventricles.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the phylum characterized by the presence of a dorsal hollow nerve cord and paired pharyngeal gill slits, we will analyze each statement provided in the options. ### Step-by-Step Solution: 1. **Identify the Key Characteristics**: The question mentions two key features: - Dorsal hollow nerve cord - Paired pharyngeal gill slits These characteristics are typical of the phylum Chordata. 2. **Examine the Statements**: - **Statement 1**: "In all protocordates, notochord extends from head to tail region and is persistent throughout life." - This statement is incorrect. While some protocordates (like cephalochordates) have a persistent notochord, others do not. - **Statement 2**: "The members of the class to which Myxin belongs show the presence of a sucking circular mouth without jaws." - This statement is correct. Myxin (hagfish) belongs to the class Cyclostomata, which is characterized by jawless fish with a circular mouth. - **Statement 3**: "Members of class Osteichthyes that can be marine or terrestrial or aquatic show the presence of an air bladder, a streamlined body, and four gills that are covered by an operculum." - This statement is partially correct but misleading. Osteichthyes (bony fish) do have an air bladder and operculum, but they do not have four gills; they typically have five pairs of gills. - **Statement 4**: "The members of the class to which the frog belongs are cold-blooded, show external fertilization, and a three-chambered heart." - This statement is incorrect. Frogs (class Amphibia) typically have a three-chambered heart (two atria and one ventricle), but they are not classified as having a three-chambered heart in the same way as reptiles do. They also show external fertilization. 3. **Conclusion**: After analyzing all the statements, the only correct statement is **Statement 2**, which accurately describes the characteristics of the class Cyclostomata to which Myxin belongs. ### Final Answer: The correct statement is: "The members of the class to which Myxin belongs show the presence of a sucking circular mouth without jaws." ---
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