given below are four statements (i)-(iv) reagarding embryonic development in humans.
(i). Cleavage divisions about considerable increase I the mass of protoplasm
(ii). With more cleavage divisions, the resultant blatomeres become smaller and smaller.
(iii). the blastomeres in the blastocyst are arranged into two layers, trophoblast and endometrium.
(iv). Cleavage divisions result in a solid ball of cells called morula.
Which of the above two statemetns are correct?

Options

A. (i) and (iii)
B. (ii) and (iv)
C. (i) and (ii)
D. (iii) and (iv)

Explanation

To determine which statements regarding embryonic development in humans are correct, let's analyze each statement step by step.

### Step-by-Step Solution:

1. **Statement (i): Cleavage divisions about considerable increase in the mass of protoplasm.**
- Cleavage divisions do not significantly increase the mass of protoplasm. Instead, they involve rapid cell division (mitosis) without an increase in overall size. Therefore, this statement is **incorrect**.

2. **Statement (ii): With more cleavage divisions, the resultant blastomeres become smaller and smaller.**
- As cleavage divisions occur, the number of cells (blastomeres) increases, but the overall size of the cells decreases because the divisions happen without significant growth in size. Thus, this statement is **correct**.

3. **Statement (iii): The blastomeres in the blastocyst are arranged into two layers, trophoblast and endometrium.**
- In the blastocyst, the blastomeres are arranged into two layers: the outer layer is called the trophoblast, and the inner mass of cells is known as the inner cell mass, not the endometrium. The endometrium is the lining of the uterus. Therefore, this statement is **incorrect**.

4. **Statement (iv): Cleavage divisions result in a solid ball of cells called morula.**
- During cleavage, a solid ball of cells known as the morula is formed. This occurs after several rounds of cell division (typically 8 to 16 cells). Therefore, this statement is **correct**.

### Conclusion:
Based on the analysis:
- Correct statements: **(ii) and (iv)**
- Incorrect statements: **(i) and (iii)**

Thus, the correct statements regarding embryonic development in humans are **(ii) and (iv)**.