Question

Cellular totipotency is demonstrated by
A. Only gymnosperm cells
B. All plant cells
C. All eukaryotic cells
D. Only bacterial cells.

Answer 1

Hint: In living organisms, the cells are dynamic units and are able to grow, develop and reproduce into other cells. Some of the cells bear the property of developing into different types of cells. The ability of the cells to grow and differentiate into other types of cells are known as cellular totipotency.

Complete answer:
Totipotency is the inherent property of the cells to give rise to several types of cells and as a result the complete organism can be formed. As this property is exhibited by the cells, it is known as cellular totipotency. This property of the cells allows the cells to potentially be capable of producing all the cell types required in a fully developed organism.
All plant cells are capable of giving rise to the different types of cell of a whole plant. The plant cells bear the inherent property of cellular totipotency and are able to produce various types of cells that can give rise to the complete individual plant. They are able to exhibit the potential of totipotency even if the cells have undergone differentiation. This property of the plant cells forms the basis of plant tissue culture.
In gymnosperms, the cells are able to grow into different types of cells when required and it is used as an important capability to withstand wear and tear. Cellular totipotency is related to withstanding any damage to the tissues and the property exists in all the plants not only the gymnosperms.
In eukaryotic organisms, few cells act as totipotent cells and they are able to differentiate into other types of cells. Spores and zygotes are totipotent cells and they are able to grow and develop into a complete organism. But all cells of the eukaryotes are not able to develop into other types of cells especially if they are already developed.
In bacterial cells, the ability of totipotency is very limited.

Hence, the correct answer is option (B).

Note: The cellular totipotency is the ability of any cell of an organism to be able to divide and have the potential to give rise to any cells of the organism. This ability of cellular totipotency is shown by all the plants cells as they are able to grow and propagate to form many plants from a single plant cell. The ability of cellular totipotency is used in the process of plant tissue culture.