A) cladodes
B) underground stems
C) vascular bundles of grass stem
D) climbers
Correct Answer: C
Solution :
Protoxylem lacunae occur in vascular bundles of grass stem. In this, the lowermost protoxylem vessels and xylem parenchyma cells dissolve forming a water containing cavity protoxylem cavity and lacuna which is lysigenous in origin.
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