After invitro fertilization :

Options

A. Embryo with more than 8 cells are implanted in uterus .
B. Embryo with more than 16 cells are not implanted in uterus .
C. Embryo with 8 -16 cells can be implanted in uterus .
D. Embryo with cells more than 16 is implanted in uterus .

Answer

**Step-by-Step Solution:**

1. **Understanding In Vitro Fertilization (IVF):**
- In vitro fertilization is a process where fertilization occurs outside the body, typically in a laboratory setting. The eggs (ova) are fertilized by sperm in a controlled environment.

2. **Development of the Embryo:**
- After fertilization, the embryo undergoes several divisions. Initially, it starts as a single cell and divides to form multiple cells. The important stages of development include the cleavage stage, where the number of cells increases.

3. **Identifying the Blastocyst Stage:**
- The embryo reaches the blastocyst stage when it has developed to approximately 8 to 16 cells. This stage is crucial as it is the point at which the embryo is ready for implantation into the uterus.

4. **Evaluating the Options:**
- **Option 1:** "Embryo with more than 8 cells are implanted in uterus."
- This is incorrect because embryos are typically implanted at the blastocyst stage, which is around 8 to 16 cells.
- **Option 2:** "Embryo with more than 16 cells are not implanted in uterus."
- This statement is misleading as embryos are not implanted at this stage; they should be at the blastocyst stage.
- **Option 3:** "Embryo with 8 to 16 cells can be implanted in uterus."
- This is correct as embryos are implanted at the blastocyst stage, which falls within this range.
- **Option 4:** "Embryo with more than 16 is implanted in uterus."
- This is incorrect because embryos are not typically implanted at this stage.

5. **Conclusion:**
- Based on the evaluation of the options, the correct answer is **Option 3:** "Embryo with 8 to 16 cells can be implanted in uterus."