The length of different internodes in a culm of sugarcane is variable because of _____________________.
The length of different internodes in a culm of sugarcane is variable because of the intercalary meristem. Intercalary meristems are capable of cell division. They allow for the rapid growth and regrowth of many monocots. Intercalary meristems at the nodes of bamboo and also internodes of sugarcane allow for the rapid stem elongation. While those at the base of most grass leaf blades will allow damaged leaves to rapidly regrow.
So, the correct answer is option B.