Rapid elongation of a bamboo stem is due to Lateral meristemIntercalary meristemApical meristemCambiumNone of the above

The rapid elongation of a bamboo stem is due to the Intercalary meristem.

Here's a step-by-step explanation:

1. Meristems are regions in plants where rapid cell division and growth occur.

2. There are three types of meristems: Apical, Lateral, and Intercalary.

3. Apical meristems are located at the tips of roots and shoots and are responsible for the plant's primary growth, or increase in length.

4. Lateral meristems (which include the cambium) are responsible for secondary growth, or increase in girth.

5. Intercalary meristems, however, are located at the base of leaves or internodes (segments between nodes of a plant stem).

6. In bamboo, the intercalary meristem allows for rapid stem elongation. This is because cells in the intercalary meristem divide and elongate quickly, pushing the stem upward and causing it to grow rapidly in length.