Which one of the following statements is correct regarding cleavage?

Options

A. Cleavage division brings about a considerable increase in the mass of protoplasm.
B. It is a type of meiotic division
C. With each cleavage division, the resultant blastomeres increases in size.
D. Cleavage division in morula leads to the development of blastula.

Answer

To solve the question regarding which statement is correct about cleavage, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Cleavage**: Cleavage refers to the series of rapid mitotic divisions that occur in the zygote after fertilization. This process does not involve significant growth of the cells but rather increases the number of cells.

2. **Analyzing the First Statement**:
- **Statement**: "Cleavage division brings about a considerable increase in the mass of protoplasm."
- **Analysis**: This statement is incorrect. During cleavage, the overall mass of protoplasm does not increase significantly because the zygote is dividing into smaller cells (blastomeres) without a corresponding increase in size.

**Hint**: Remember that cleavage is about division, not growth.

3. **Analyzing the Second Statement**:
- **Statement**: "It is the type of meiotic division."
- **Analysis**: This statement is also incorrect. Cleavage involves mitotic divisions, not meiotic divisions. Meiosis is a different type of cell division that reduces the chromosome number, while cleavage maintains the chromosome number.

**Hint**: Distinguish between mitosis (cleavage) and meiosis.

4. **Analyzing the Third Statement**:
- **Statement**: "With each cleavage division, the resultant blastomeres increase in size."
- **Analysis**: This statement is incorrect. Each cleavage division results in smaller blastomeres because the total volume of the zygote is divided among more cells, leading to smaller cell sizes.

**Hint**: Consider how cell division affects cell size.

5. **Analyzing the Fourth Statement**:
- **Statement**: "Cleavage division in morula leads to the development of blastula."
- **Analysis**: This statement is correct. The morula is a solid ball of cells formed after several cleavage divisions, and it eventually develops into the blastula, which is a hollow sphere of cells.

**Hint**: Recall the developmental stages from morula to blastula.

### Conclusion:
The correct answer is **Option 4**: "Cleavage division in morula leads to the development of blastula."