Which of the following statements is correct about cyclostomata ?

Options

A. Members possess 6-15 gill slits.
B. Mouth is suctorial without jaws.
C. Ambyostoma is one of the example.
D. All of the above .

Answer

To determine which statement is correct about Cyclostomata, we will evaluate each option provided in the question step by step.

### Step 1: Analyze the First Statement
The first statement claims that "members possess 6 to 15 gill slits."
- **Evaluation**: This statement is incorrect because Cyclostomata actually possess 6 to 15 pairs of gill slits, not just 6 to 15 gill slits. The term "pairs" is crucial here as it indicates that there are two gill slits for each pair.

### Step 2: Analyze the Second Statement
The second statement states that "the mouth is sucker-like and without jaws."
- **Evaluation**: This statement is correct. Cyclostomata, which include species like lampreys and hagfish, have a circular, sucker-like mouth that lacks jaws. This is a defining characteristic of this group.

### Step 3: Analyze the Third Statement
The third statement mentions "Amboistoma is an example."
- **Evaluation**: This statement is incorrect. Amboistoma is not a member of Cyclostomata; it is actually a genus of salamanders. Cyclostomata includes jawless fish like lampreys and hagfish.

### Step 4: Analyze the Fourth Statement
The fourth option states "all of the above."
- **Evaluation**: Since the first, third, and fourth statements are incorrect, this option is also incorrect.

### Conclusion
After evaluating all the statements, the only correct statement regarding Cyclostomata is the second one: "the mouth is sucker-like and without jaws."

### Final Answer
The correct statement about Cyclostomata is: **Mouth is sucker-like without jaws.**

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