In the production of the test-tube baby ,

Options

A. fertilization is internal and development is external .
B. fertilization is external and development is internal .
C. fertilization and development external .
D. fertilization and development are internal .

Answer

To solve the question regarding the production of a test-tube baby, we need to understand the processes involved in this assisted reproductive technology. Here’s a step-by-step solution:

### Step 1: Understanding the Process
In the production of a test-tube baby, the first step involves the stimulation of the ovaries to produce multiple eggs. This is usually achieved through hormone therapy.

**Hint:** Remember that hormone therapy is crucial for egg production in assisted reproductive technologies.

### Step 2: Egg Retrieval
Once the eggs are mature, they are retrieved from the ovaries. This is typically done using a minor surgical procedure.

**Hint:** Think about how eggs are collected from the female body for fertilization.

### Step 3: Fertilization
After the eggs are retrieved, they are combined with sperm in a laboratory setting. This process is known as in vitro fertilization (IVF), where fertilization occurs outside the body.

**Hint:** Focus on the term "in vitro," which means "in glass," indicating that fertilization happens outside the body.

### Step 4: Introduction of the Embryo
Once fertilization occurs and the zygote (fertilized egg) develops into an embryo, the embryo is then introduced into the uterus of the female.

**Hint:** Consider where the embryo develops after fertilization; it’s important to distinguish between external and internal development.

### Step 5: Conclusion
Based on the steps outlined, we can conclude that in the production of a test-tube baby, fertilization occurs externally (in the lab), while the development of the embryo takes place internally (in the uterus). Therefore, the correct answer is that fertilization is external and development is internal.

**Final Answer:** Fertilization is external and development is internal (Option 2).