The concept of cellular totipotency was given by

Options

A. Steward
B. Vasil and Hilderbrandt
C. Carlson et al
D. Barski et al.

Answer

**Step-by-Step Text Solution:**

1. **Understanding Cellular Totipotency**: The term "cellular totipotency" refers to the ability of a single cell to divide and develop into a complete organism. In plants, this means that a single cell can give rise to all the different types of cells and tissues necessary to form a new plant.

2. **Identifying the Scientist**: The question asks who first illustrated the concept of cellular totipotency. We need to look for the scientist who made significant contributions to this concept.

3. **Reviewing the Options**:
- A. Stewart
- B. Wessel and Hildebrand
- C. Carlson et al
- D. Babersky et al

4. **Finding the Correct Answer**: F. C. Stewart is recognized for demonstrating that plant cells from various parts (like roots, stems, leaves, buds, and embryos) can be cultured in a controlled environment to form new plants. This illustrates the concept of cellular totipotency.

5. **Conclusion**: Based on the contributions of F. C. Stewart, the correct answer to the question is option A.

**Final Answer**: The concept of cellular totipotency was given by A. Stewart.

---