Cellular totipotency was demostrated by

Options

A. Theodore Schwann
B. A.V. Leeuwenhoek
C. F.C. Steward
D. Robert Hooke.

Answer

**Step-by-Step Solution:**

1. **Understanding Cellular Totipotency**: Cellular totipotency refers to the ability of a single cell to divide and develop into a complete organism. This concept is crucial in developmental biology and plant tissue culture.

2. **Identifying the Key Experiment**: The question asks who demonstrated cellular totipotency. We need to look for a scientist who conducted significant experiments in this area.

3. **Evaluating the Options**:
- A. Theodore Schwann: Known for cell theory but not specifically for totipotency.
- B. A. V. Leeuwenhoek: Known for microscopy but not for totipotency.
- C. F. C. Stewart: Conducted experiments on plant tissue culture and demonstrated totipotency.
- D. Robert Hooke: Known for discovering cells but not for totipotency.

4. **Focusing on F. C. Stewart's Experiment**: In 1957, F. C. Stewart conducted an experiment using 2 mg of phloem from carrot roots. He placed these explants in a liquid culture medium enriched with coconut milk.

5. **Observing the Results**: The explants showed active growth and cell division. After shaking, the cells formed clusters which differentiated into root initials and eventually developed into shoots and roots, leading to the formation of a complete plantlet.

6. **Conclusion**: Based on the experiment and its findings, it is clear that cellular totipotency was demonstrated by F. C. Stewart.

**Final Answer**: C. F. C. Stewart

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