the origin of germ layers in chick embryo was described by

Options

A. Hans Speman
B. Pander
C. Charles Bonnet
D. None of the above.

Answer

To answer the question regarding the origin of germ layers in the chick embryo, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Question**: The question asks about who described the origin of germ layers in the chick embryo.

2. **Analyze the Options**: The options provided are:
- A. Hens Piemann
- B. Pender
- C. Charles Bonnet
- D. None of the above

3. **Research Each Scientist**:
- **Hens Piemann**: He was a German embryologist known for his work on embryonic induction and won a Nobel Prize for his contributions to physiology.
- **Pender**: He is recognized as the father of embryology and is specifically noted for his work on the origin and structure of the three germ layers in chick embryos.
- **Charles Bonnet**: He is known for his discovery of parthenogenesis, which is a form of asexual reproduction, not directly related to germ layers.

4. **Determine the Correct Answer**: Based on the information gathered, Pender is the scientist who described the origin of the germ layers in the chick embryo.

5. **Select the Answer**: Therefore, the correct answer is **B. Pender**.

### Final Answer:
The origin of germ layers in the chick embryo was described by **B. Pender**.

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