Which one / ones is pair correct match?
A. Solid ball - Morula
B. Hollow ball - Blastocyst
C. Child birth - Colostrum
D. Daughter cells - Blastomers

Options

A. A, B, D
B. A, B, C
C. C, D
D. A, B, C, D

Answer

To determine which pairs are correct matches, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Option A: Solid ball - Morula**
- The morula is indeed a solid ball of cells formed after several divisions of the zygote. It typically consists of about 8-16 cells and resembles a solid structure.
- **Conclusion**: This match is correct.

2. **Option B: Hollow ball - Blastocyst**
- The blastocyst is a structure that forms after the morula stage. It is characterized by a hollow cavity called the blastocoel. The outer layer of cells forms the trophoblast, and the inner cell mass will eventually develop into the embryo.
- **Conclusion**: This match is also correct.

3. **Option C: Childbirth - Colostrum**
- Childbirth refers to the process of delivering a baby, known as parturition. Colostrum, on the other hand, is the first milk produced by the mother after childbirth. It is not synonymous with childbirth itself.
- **Conclusion**: This match is incorrect.

4. **Option D: Daughter cells - Blastomeres**
- After the zygote undergoes cleavage, the resulting cells are called blastomeres. These are indeed the daughter cells formed during the early stages of embryonic development.
- **Conclusion**: This match is correct.

### Final Conclusion:
The correct matches are:
- A: Solid ball - Morula (Correct)
- B: Hollow ball - Blastocyst (Correct)
- C: Childbirth - Colostrum (Incorrect)
- D: Daughter cells - Blastomeres (Correct)

Thus, the pairs that are correct are A, B, and D.