How many statements are correct for second largest phylum ?
(A)Animals of this phylum are terrestrial or only marine
(B)The mouth contains a file - like rasping organ for feeding, called radula .
(C )They are bilaterally symmetrical and enterocoelomate animals.
(D)Animals have only open type of blood vascular system.

Options

A. 1
B. 2
C. 3
D. 4

Answer

To determine how many statements are correct regarding the second largest phylum, which is the Mollusca, we will analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Identify the Second Largest Phylum**:
- The second largest phylum in the animal kingdom is Mollusca. The largest phylum is Arthropoda.

**Hint**: Remember that Mollusca includes animals like snails, clams, and octopuses.

2. **Evaluate Statement (A)**:
- "Animals of this phylum are terrestrial or only marine."
- This statement is incorrect because mollusks can be found in both marine and freshwater environments, not just marine.

**Hint**: Consider the habitats of different mollusks, including freshwater species.

3. **Evaluate Statement (B)**:
- "The mouth contains a file-like rasping organ for feeding, called radula."
- This statement is correct. Mollusks possess a radula, which is a specialized feeding organ used to scrape food.

**Hint**: Recall the function of the radula in feeding among mollusks.

4. **Evaluate Statement (C)**:
- "They are bilaterally symmetrical and enterocoelomate animals."
- This statement is correct. Mollusks exhibit bilateral symmetry and possess a true coelom, which is a body cavity lined by mesoderm.

**Hint**: Think about the body symmetry and internal structure of mollusks.

5. **Evaluate Statement (D)**:
- "Animals have only open type of blood vascular system."
- This statement is also correct. Most mollusks have an open circulatory system, where blood is not always contained within blood vessels.

**Hint**: Consider the circulatory systems of different animal phyla.

6. **Count the Correct Statements**:
- From our evaluation, we found that:
- Statement (A) is incorrect.
- Statements (B), (C), and (D) are correct.
- Therefore, there are 3 correct statements.

### Final Answer:
The number of correct statements for the second largest phylum (Mollusca) is **3**.