A) Monarch - Nicotiana tabacum
B) Diarch - Trapa nalans
C) Triarch - Pisum sativum
D) Tetrarch - Ricinus commimis
Correct Answer: C
Solution :
In roots, the xylem is a solid core with ridge like projections extending towards the pericycle. In relation to number of xylem ridges present in the roots, xylem my be called as monarch (Trapa), diarch (Nicotiana), triarch (Pisum sativum), tetrach. penetarch (Ricinus).
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