Read the following statements and choose the correct option
(i) Aves are homothermous
(ii) Pinnae are present in mammals
(iii) Operculum is present in chondrichthyes
(iv) Skin of amphibians is dry and horny .
(v) Open type of circulation is found in cyclostomes

Options

A. `i` and ii are wrong
B. ii , iii and iv are wrong
C. `i` , ii and iv are wrong
D. iii, iv and v are wrong .

Answer

To solve the question, we need to analyze each statement one by one and determine whether they are correct or incorrect.

### Step-by-Step Solution:

1. **Statement (i): Aves are homothermous.**
- Aves (birds) are indeed homeothermic, meaning they maintain a constant body temperature regardless of the environment. Therefore, this statement is **correct**.

2. **Statement (ii): Pinnae are present in mammals.**
- Pinnae refers to the external ear structure. Mammals typically have external ears (pinnae) that are visible and made of cartilage. Thus, this statement is also **correct**.

3. **Statement (iii): Operculum is present in chondrichthyes.**
- Chondrichthyes, which include sharks and rays, do not have an operculum. Instead, they have exposed gill slits. Therefore, this statement is **incorrect**.

4. **Statement (iv): Skin of amphibians is dry and horny.**
- Amphibians have moist and smooth skin, which is essential for their respiration and hydration. Hence, this statement is **incorrect**.

5. **Statement (v): Open type of circulation is found in cyclostomes.**
- Cyclostomes (like lampreys) have a closed circulatory system, not an open one. Therefore, this statement is **incorrect**.

### Summary of Statements:
- (i) Correct
- (ii) Correct
- (iii) Incorrect
- (iv) Incorrect
- (v) Incorrect

### Conclusion:
The correct option is that statements (i) and (ii) are correct, while statements (iii), (iv), and (v) are incorrect.

### Final Answer:
The correct option is: **Statements (i) and (ii) are correct.**

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