During development which of the following organs is formed first
(a) Heart
(b) Brain
(c) Neural tube
(d) Skin

Options

A. Heart
B. Brain
C. Neural tube
D. Skin.

Answer

To determine which organ is formed first during development, we can analyze the options provided:

1. **Understanding Developmental Stages**:
- During embryonic development, there are specific stages where different structures and organs begin to form. The process starts with the formation of germ layers during gastrulation.

2. **Identifying the Germ Layers**:
- The three primary germ layers formed during gastrulation are:
- Ectoderm
- Mesoderm
- Endoderm
- These layers give rise to various organs and systems in the body.

3. **Formation of the Notochord**:
- Along with the germ layers, the notochord is also formed during gastrulation. The notochord is derived from the mesoderm and plays a crucial role in the development of the nervous system.

4. **Neural Tube Formation**:
- The neural tube, which is the precursor to the brain and spinal cord, is formed from the ectoderm. The formation of the neural tube is one of the earliest events in the development of the nervous system.

5. **Order of Organ Formation**:
- After the neural tube, the heart is one of the next structures to develop. The brain develops from the neural tube later in the embryonic stage. Skin is one of the later structures to form as well.

6. **Conclusion**:
- Based on the above analysis, the first organ to be formed during development is the **neural tube**.

Thus, the correct answer is:
**(c) Neural tube**