Which of the following statements are correct about the cellular organization?
I. Mesoglea is the layer present between ectoderm and endoderm of diploblastic animals.
II. Mesoderm is the layer present between ectoderm and endoderm of diploblastic animals.
III. Mesoglea is the layer present between the ectoderm and endoderm of triploblastic animals.
IV. Mesoderm is the layer present between ectoderm and endoderm of triploblastic animals.

Options

A. I and II
B. I and III
C. II and IV
D. I and IV

Answer

To solve the question regarding the correct statements about cellular organization, let's analyze each statement one by one.

### Step-by-Step Solution:

1. **Understanding Diploblastic and Triploblastic Animals**:
- Diploblastic animals have two germ layers: ectoderm and endoderm. They also possess a jelly-like layer called mesoglea between these two layers.
- Triploblastic animals have three germ layers: ectoderm, mesoderm, and endoderm.

2. **Analyzing Statement I**:
- **Statement I**: "Mesoglea is the layer present between ectoderm and endoderm of diploblastic animals."
- This statement is **correct**. Mesoglea is indeed the layer found between the ectoderm and endoderm in diploblastic animals.

3. **Analyzing Statement II**:
- **Statement II**: "Mesoderm is the layer present between ectoderm and endoderm of diploblastic animals."
- This statement is **incorrect**. Mesoderm is not present in diploblastic animals; it is a characteristic of triploblastic animals.

4. **Analyzing Statement III**:
- **Statement III**: "Mesoglea is the layer present between the ectoderm and endoderm of triploblastic animals."
- This statement is **incorrect**. Mesoglea is not found in triploblastic animals; it is specific to diploblastic animals.

5. **Analyzing Statement IV**:
- **Statement IV**: "Mesoderm is the layer present between ectoderm and endoderm of triploblastic animals."
- This statement is **correct**. In triploblastic animals, the mesoderm is the layer found between the ectoderm and endoderm.

### Conclusion:
Based on the analysis:
- **Correct Statements**: I and IV
- **Incorrect Statements**: II and III

Thus, the correct answer is that statements I and IV are correct.

### Final Answer:
The correct statements about cellular organization are:
- I. Mesoglea is the layer present between ectoderm and endoderm of diploblastic animals.
- IV. Mesoderm is the layer present between ectoderm and endoderm of triploblastic animals.

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