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The length of different internodes in a culm of sugarcane is variable because of

1. shoot apical meristem
2. position of axillary buds
3. size, activity of the node below each internode
4. intercalary meristem

Correct answer: intercalary meristem

Solution

Different internodes vary in length because intercalary meristems continue cell division and elongation at the bases of internodes. This causes each internode to grow independently to different extents.

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