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. Mesoderm 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, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement I: Mesoglea is the layer present between ectoderm and endoderm of diploblastic animals.**
- **Analysis:** This statement is correct. Diploblastic animals, such as cnidarians, have two germ layers: ectoderm and endoderm. The jelly-like substance that lies between these two layers is called mesoglea.

2. **Statement II: Mesoderm is the layer present between ectoderm and endoderm of diploblastic animals.**
- **Analysis:** This statement is incorrect. Diploblastic animals do not have a mesoderm; they only possess ectoderm and endoderm. The presence of mesoderm is characteristic of triploblastic animals.

3. **Statement III: Mesoderm is the layer present between the ectoderm and endoderm of triploblastic animals.**
- **Analysis:** This statement is correct. Triploblastic animals have three germ layers: ectoderm, mesoderm, and endoderm. The mesoderm is indeed the layer that lies between the ectoderm and endoderm.

4. **Statement IV: Mesoderm is the layer present between ectoderm and endoderm of triploblastic animals.**
- **Analysis:** This statement is also correct. It is identical to Statement III, confirming that mesoderm is the layer found between the ectoderm and endoderm in triploblastic animals.

### Conclusion:
- The correct statements are I, III, and IV.
- The incorrect statement is II.

### Final Answer:
The correct statements about cellular organization are I, III, and IV.

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