An embryoid is

Options

A. Somatic embryo developed in culture
B. A microscopic embryo
C. A monozygotic embryo formed by in vitro culture
D. Haploid

Answer

**Step-by-Step Solution:**

1. **Understanding the Term "Embryoid":**
- An embryoid is defined as a three-dimensional structure that contains pluripotent cells, which are capable of differentiating into various cell types.

2. **Characteristics of Embryoids:**
- Embryoids can be cultured on artificial media, which provides all the necessary nutrients and conditions for growth.
- They are formed in vitro, meaning they are developed outside of a living organism, typically in a laboratory setting.

3. **Identifying the Correct Option:**
- The options provided are:
a) A somatic embryo developed in culture
b) A microscopic embryo
c) A monozygotic embryo formed by in vitro culture
d) Haploid
- Analyzing each option:
- **Option a:** A somatic embryo developed in culture fits the definition of an embryoid, as it is formed from somatic cells cultured in vitro.
- **Option b:** A microscopic embryo does not accurately describe an embryoid.
- **Option c:** A monozygotic embryo is incorrect because embryoids are non-zygotic.
- **Option d:** Haploid is also incorrect since embryoids can be formed from diploid or polyploid cells.

4. **Conclusion:**
- Based on the analysis, the correct answer is **a) A somatic embryo developed in culture**.