Pollen embryoids were discovered by

Options

A. Konar and Nataraja
B. Guha and Maheshwari
C. Skoog and Miler
D. Helperin and Wetherell.

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks who discovered pollen embryoids.

2. **Review the Options**: The options provided are:
- a. Conard and Nataraja
- b. Guha and Maheshwari
- c. Skok and Miller
- d. Halperin and Wetherill

3. **Research the Discovery**: The technique of producing pollen embryos is specifically associated with the work of Guha and Maheshwari. They conducted experiments involving pollen culture.

4. **Explain the Process**: Guha and Maheshwari discovered that by squeezing the anther of flowers and placing the pollen grains in a sterile hypochlorite solution, they could culture the pollen grains.

5. **Culturing Pollen**: The cultured pollen grains were then placed on nutrient media, which allowed them to develop into pollen embryos.

6. **Treatment of Pollen Embryos**: The pollen embryos could be treated with auxin to promote rooting and with cytokinin to facilitate cell differentiation and growth, leading to stem development.

7. **Conclusion**: Based on the information gathered, the correct answer to the question is option b: Guha and Maheshwari.

**Final Answer**: The discovery of pollen embryoids was made by **Guha and Maheshwari** (option b).

---